Max.1974 Posted July 21, 2025 Share Posted July 21, 2025 (edited) Tutorial: How to Safely Install macOS Tahoe on Another Volume (Without Erasing Your Current System) ⚠️ This method ensures you do NOT erase your current system. Ideal for installing macOS Tahoe on an external or secondary APFS volume. Requirements: - The official macOS Tahoe installer (InstallAssistant.pkg) must be downloaded first - Run the .pkg to extract Install macOS Tahoe Beta.app into your /Applications folder - The target volume must be formatted as APFS - Terminal access (Ventura, Sonoma, or newer) Instructions: 1. First, download the macOS Tahoe Beta 3 or 4 installer as a .pkg file (example: InstallAssistant.pkg) https://github.com/perez987/DownloadFullInstaller/releases 2. Double-click the .pkg file and complete the installation. This will place the Install macOS Tahoe Beta.app into your /Applications folder 3. Make sure your target volume is already formatted as APFS and mounted 3.1 The installation succeeded with SIP disabled in recovery mode. In the recovery terminal, type the following commands: csrutil disable csrutil authenticated-root disable reboot 4. Open the Terminal app 5. Copy and paste the following command into a single line in Terminal and press Enter: English: echo "🔹 Drag and drop the target volume here and press Enter:"; read target_volume; echo "📝 Enter the new name you want to give the volume (or press Enter to keep the current one):"; read custom_name; current_root=$(df / | tail -1 | awk '{print $1}'); dragged_device=$(df "$target_volume" 2>/dev/null | tail -1 | awk '{print $1}'); if [ "$dragged_device" = "$current_root" ]; then echo "❌ ERROR: You are trying to erase the volume where the current system is running. Operation cancelled."; exit 1; fi; original_mount_point="$target_volume"; if [ -n "$custom_name" ]; then diskutil rename "$target_volume" "$custom_name"; target_volume="$(dirname "$original_mount_point")/$custom_name"; fi; echo "✅ Final confirmed target volume: $target_volume"; sudo /Applications/Install\ macOS\ Tahoe\ Beta.app/Contents/Resources/startosinstall --volume "$target_volume" --agreetolicense --nointeraction --passprompt --rebootdelay 60 Portuguese: echo "🔹 Arraste e solte o volume de destino aqui, depois pressione Enter:"; read target_volume; echo "📝 Digite um novo nome para o volume (ou pressione Enter para mantê-lo):"; read custom_name; current_root=$(df / | tail -1 | awk '{print $1}'); dragged_device=$(df "$target_volume" 2>/dev/null | tail -1 | awk '{print $1}'); if [ "$dragged_device" = "$current_root" ]; then echo "❌ ERRO: Você está tentando apagar o sistema atualmente em execução. Operação cancelada."; saída 1; fi; original_mount_point="$target_volume"; if [ -n "$custom_name" ]; então diskutil renomear "$target_volume" "$custom_name"; target_volume="$(dirname "$original_mount_point")/$custom_name"; fi; eco "✅ Volume de destino final confirmado: $target_volume"; sudo /Applications/\Install macOS\ Tahoe\ Beta.app/Contents/Resources/startosinstall --volume "$target_volume" --agreetolicense --nointeraction --passprompt --rebootdelay 6. Follow the Terminal prompts: - Drag and drop the target volume into the Terminal window - Rename the volume (optional) - Enter your admin password when requested 7. The macOS Tahoe installation will start on the selected volume. Your current macOS system will not be erased or modified This is the safest method for testing macOS Tahoe without affecting your main setup The goal of this tutorial is to avoid the usual installation delays, eliminate the need for USB drives, and most importantly, avoid using third-party apps. It is especially useful in cases where the mouse loop issue occurs, and the installation completes in under 15 minutes. Make sure your EFI is compatible, and back up your data. Video tutorial https://youtu.be/EPRA41XxpfA Enjoy it!! Edited July 23, 2025 by Max.1974 4 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/ Share on other sites More sharing options...
STLVNUB Posted July 21, 2025 Share Posted July 21, 2025 I Don't Think Your Step 5 Is Gonna Work, Change To English 1 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837565 Share on other sites More sharing options...
Max.1974 Posted July 21, 2025 Author Share Posted July 21, 2025 Works fine my friend in both languages 2 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837566 Share on other sites More sharing options...
STLVNUB Posted July 21, 2025 Share Posted July 21, 2025 1 hour ago, Max.1974 said: Works fine my friend in both languages My Bad 1 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837567 Share on other sites More sharing options...
Max.1974 Posted July 21, 2025 Author Share Posted July 21, 2025 (edited) Im sorry my friend I think was translated to English hahaha its my bad!! 😁 Tell me if works for you!! I was prepare installer in partition. Edited July 21, 2025 by Max.1974 2 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837569 Share on other sites More sharing options...
Mirone Posted July 22, 2025 Share Posted July 22, 2025 Good job, thanks for sharing with everyone! 2 1 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837571 Share on other sites More sharing options...
Max.1974 Posted July 22, 2025 Author Share Posted July 22, 2025 15 hours ago, Mirone said: Good job, thanks for sharing with everyone! @Mirone Don't forget, my friend — your knowledge is extremely valuable. Whenever you want, you have the ability to create amazing apps! 3 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837615 Share on other sites More sharing options...
STLVNUB Posted July 23, 2025 Share Posted July 23, 2025 (edited) On 7/22/2025 at 6:51 AM, Max.1974 said: Tutorial: How to Safely Install macOS Tahoe on Another Volume (Without Erasing Your Current System) ⚠️ This method ensures you do NOT erase your current system. Ideal for installing macOS Tahoe on an external or secondary APFS volume. Requirements: - The official macOS Tahoe installer (InstallAssistant.pkg) must be downloaded first - Run the .pkg to extract Install macOS Tahoe Beta.app into your /Applications folder - The target volume must be formatted as APFS - Terminal access (Ventura, Sonoma, or newer) Instructions: 1. First, download the macOS Tahoe Beta 3 installer as a .pkg file (example: InstallAssistant.pkg) https://github.com/perez987/DownloadFullInstaller/releases 2. Double-click the .pkg file and complete the installation. This will place the Install macOS Tahoe Beta.app into your /Applications folder 3. Make sure your target volume is already formatted as APFS and mounted 3.1 The installation succeeded with SIP disabled in recovery mode. In the recovery terminal, type the following commands: csrutil disable csrutil authenticated-root disable reboot 4. Open the Terminal app 5. Copy and paste the following command into a single line in Terminal and press Enter: English: echo "🔹 Drag and drop the target volume here and press Enter:"; read target_volume; echo "📝 Enter the new name you want to give the volume (or press Enter to keep the current one):"; read custom_name; current_root=$(df / | tail -1 | awk '{print $1}'); dragged_device=$(df "$target_volume" 2>/dev/null | tail -1 | awk '{print $1}'); if [ "$dragged_device" = "$current_root" ]; then echo "❌ ERROR: You are trying to erase the volume where the current system is running. Operation cancelled."; exit 1; fi; original_mount_point="$target_volume"; if [ -n "$custom_name" ]; then diskutil rename "$target_volume" "$custom_name"; target_volume="$(dirname "$original_mount_point")/$custom_name"; fi; echo "✅ Final confirmed target volume: $target_volume"; sudo /Applications/Install\ macOS\ Tahoe\ Beta.app/Contents/Resources/startosinstall --volume "$target_volume" --agreetolicense --nointeraction --passprompt --rebootdelay 60 Portuguese: echo "🔹 Arraste e solte o volume de destino aqui, depois pressione Enter:"; read target_volume; echo "📝 Digite um novo nome para o volume (ou pressione Enter para mantê-lo):"; read custom_name; current_root=$(df / | tail -1 | awk '{print $1}'); dragged_device=$(df "$target_volume" 2>/dev/null | tail -1 | awk '{print $1}'); if [ "$dragged_device" = "$current_root" ]; then echo "❌ ERRO: Você está tentando apagar o sistema atualmente em execução. Operação cancelada."; saída 1; fi; original_mount_point="$target_volume"; if [ -n "$custom_name" ]; então diskutil renomear "$target_volume" "$custom_name"; target_volume="$(dirname "$original_mount_point")/$custom_name"; fi; eco "✅ Volume de destino final confirmado: $target_volume"; sudo /Applications/\Install macOS\ Tahoe\ Beta.app/Contents/Resources/startosinstall --volume "$target_volume" --agreetolicense --nointeraction --passprompt --rebootdelay 6. Follow the Terminal prompts: - Drag and drop the target volume into the Terminal window - Rename the volume (optional) - Enter your admin password when requested 7. The macOS Tahoe installation will start on the selected volume. Your current macOS system will not be erased or modified This is the safest method for testing macOS Tahoe without affecting your main setup The goal of this tutorial is to avoid the usual installation delays, eliminate the need for USB drives, and most importantly, avoid using third-party apps. It is especially useful in cases where the mouse loop issue occurs, and the installation completes in under 15 minutes. Make sure your EFI is compatible, and back up your data. Video tutorial https://youtu.be/EPRA41XxpfA Enjoy it!! Just A Thought, Why Not Make An App That Makes It Easier For Users To Install, Easy Enough To Do Edit: Why Not Ask WHICH WAY The User Would Like To Install startosinstall: Straight To SSD OR creatmediainstall: Create USB Install Edited July 23, 2025 by STLVNUB 1 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837696 Share on other sites More sharing options...
Max.1974 Posted July 23, 2025 Author Share Posted July 23, 2025 Hi @STLVNUB my friend, surely the app would be great, and I talked to our friend, coder Mirone, and he’ll take care of it when he can. However, the command is simple — just follow the instructions, and it does the same thing an app would do. Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837701 Share on other sites More sharing options...
STLVNUB Posted July 23, 2025 Share Posted July 23, 2025 2 minutes ago, Max.1974 said: Hi @STLVNUB my friend, surely the app would be great, and I talked to our friend, coder Mirone, and he’ll take care of it when he can. However, the command is simple — just follow the instructions, and it does the same thing an app would do. Yeah, I Know, But Just Wanted To Make It Easier For The Lazy Ones, Like Me 2 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837702 Share on other sites More sharing options...
Max.1974 Posted July 23, 2025 Author Share Posted July 23, 2025 15 minutes ago, STLVNUB said: Yeah, I Know, But Just Wanted To Make It Easier For The Lazy Ones, Like Me Check this out, is more easy but is for fresh install and new installation on System. 1 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837704 Share on other sites More sharing options...
nmano Posted July 24, 2025 Share Posted July 24, 2025 Hi My Friend Your command worked very well. Thank you so much.Please make same command mac os sequoia 15.5 Thanks again. 1 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837794 Share on other sites More sharing options...
Max.1974 Posted July 24, 2025 Author Share Posted July 24, 2025 Hi @nmano I will provide my friend. Today i will post here after test in my machine. Thanks and so glad that works for you. Congrats. 😉🤓 1 Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837822 Share on other sites More sharing options...
Max.1974 Posted July 25, 2025 Author Share Posted July 25, 2025 15 hours ago, nmano said: Hi My Friend Your command worked very well. Thank you so much.Please make same command mac os sequoia 15.5 Thanks again. @nmano enjoy it Link to comment https://www.insanelymac.com/forum/topic/361390-install-macos-tahoe-beta-3-or-4-from-the-terminal-%E2%80%93-drag-and-drop-your-target-choose-your-hdssdnvme/#findComment-2837850 Share on other sites More sharing options...
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