Hi Eric, When you do an upgrade, the upgrader .exe file creates a folder named "Back" in your Vue 4 main directory. To revert after upgrading, simply open that folder and copy the contents of it and paste them in the main directory that vue4.exe is in. The Back folder itself contains other folder, such as "Modules", "Plants", "Environment", etc. It would be a good idea to make a copy of the "Back" folder and put it somewhere else on your HD prior to running a newer patch, though, just in case.