I installed CS4 on a fresh install of Windows and have been using it for awhile but I would like to install CS3 now as well (because I feel it does certain tasks better), and use each one as needed. However, I'm concerned about issues resulting from installing CS3 after CS4. I have heard that it may make the registration invalid, AME not work, and is you open dynamic link in CS3 it opens the CS4 version of the app. I'm mainly concerned with Premiere and After Effects, and don't mind don't installing other apps in the suite.
Has anyone attempted this? Any tips?
I have read on here that some people had problems with cs4 installed and then they uninstalled cs3. They reported that some files were removed in cs4 as a result. Don't know about installing cs3 afterwards tho.
Another thing to consider is that I believe that a cs4 project will not import into cs3. cs3 will import into cs4 but not the opposite.