Leave a comment below with the exact error code from your preparation.exe log file, and we will provide a targeted fix within 24 hours.
Environment Scanning: It checks for existing VS 2012 components and their current patch levels. visual studio 2012 update 5 preparationexe top
Some extensions for VS 2012 don't recognize newer "Community" naming conventions. You may need to manually uninstall legacy extensions before updating. Conclusion Leave a comment below with the exact error