I had bought CS3 (installed, under Vista x64) and was entitled to an upgrade to CS4 which I have not installed yet.
I know it is not recommended to work projects started in CS3 into CS4. But can I install both versions on my system without functionnality problems ?(I mean in two distinct folder of course, but what about the stuff linked into Windows?). So I can keep working projects started in CS3 and then start new projects with CS4 ?
I have the 2.0 and CS4 suites installed at the same time. Both seem to work as they should. The only caveat may be Dynamic Link. I haven't tried that functionality yet, so I don't know if there might be cross-version issues.
I have CS3 and CS4 installed on two different computers and do not see any problems due to their coexistence . The only thing I have seen in the forums is a caution to not remove CS3 after installing CS4 as it apparently shares some files with CS4.
I have 6.5, Ppro 1.5, Ppro 3, Ppro 4 all serving their purpose on the same machine and sharing plugins. CS4 hates some plugins and crashes once I use any old plugin but other than that eveything is cooool