I want to update but I'm afraid of losing my liveries as I have downloaded and installed a lot... what is the easiest process to keep them without having to reinstalling them back again? Can I just make a copy of my aircraft.cfg files in each of their respective directories, and after I update, just go in and copy the entries and paste them back into the new aircraft.cfg?

Since we have to uninstall and reinstall the PMDG planes now instead of using the operations center... I want to make sure that I won't lose my liveries. 

Mine are still there. Did not have to redownload them. Had a couple livery errors when i fired up the op center and it quickly rectified it. Pretty sure the uninstaller doesnt remove liveries and options as they would have to be deleted manually.