Solution: lion upgrade an error occurred while preparing the installation
By nick | Uncategorized21 Dec 2011
Having recently having build a hackintosh, I found I received the following error when trying to upgrade to Lion:
lion upgrade an error occurred while preparing the installation
Here’s the solution:
1. A file will appear “Install Mac OS X Lion”.
2. Right click the file, and click on “Show Contents”.
3. Go inside the “Contents” folder, and then “SharedSupport”.
4. Double click “InstallESD.dmg”.
5. It will verify for a minute or two, and then the actual installation file “Install Mac OS X Lion” will appear in a new window. Double click that file and follow the instructions.
2. Right click the file, and click on “Show Contents”.
3. Go inside the “Contents” folder, and then “SharedSupport”.
4. Double click “InstallESD.dmg”.
5. It will verify for a minute or two, and then the actual installation file “Install Mac OS X Lion” will appear in a new window. Double click that file and follow the instructions.
Let me know in the comments if this helped or you found another solution!
This app note about installing on a RAID disk helped me: http://support.apple.com/kb/TS4212
many thanks for posting this issue and the solution. I had the same problem, tried your solution … and it seems to be working (at least, it has gone past the annoyingly obscure ‘An error has occurred while preparing the installation, etc’.