I had this problem, and it is solved:
my purchased download had something wrong: was the good size, was able to install OSX, but a checksum was not good.
Downloaded it again, and now it is ok.
To check, right clic on the install mountain lion app, then "show contents", go to shared support > InstallESD.dmg
Try to mount it: it is verified, then you may have something about cjecksum error.
jmangeliniMember Since 14 Aug 2011
Offline Last Active Nov 18 2012 11:04 PM
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