$tealth Posted July 17, 2020 Share Posted July 17, 2020 HI, I have MAC BOOK AIR Dec 2017. I have Quad OS installed on the computer on the same Harddisk 1. MACOS X 10.13.6 2. MACOSX 10.14.6 3. MACOSX 10.15.5 - Update unsuccessful to 10.15.6 4. MACOS 11 Big Sur I have installed all these OS on the same Harddrive. When I try to update via the Update MACOSX 10.5.6 option the update continuous for some time computer restarts and update does not take place. I have even tried using the combo pack to update and SMC Reset and NV Ram Reset I have tried. Does anybody have any other option to update combo pack Appreciate your help Thanking you $tealth Link to comment https://www.insanelymac.com/forum/topic/344548-unable-to-update-to-10156-from-10155/ Share on other sites More sharing options...
Ethan Jarvis Posted August 14, 2020 Share Posted August 14, 2020 I would like to suggest you try to Boot into Safe Mode and then download & install the macOS Catalina 10.15.6 Combo Update. Link to comment https://www.insanelymac.com/forum/topic/344548-unable-to-update-to-10156-from-10155/#findComment-2734163 Share on other sites More sharing options...
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