Currently I am trying to install the 30-day trial of Adobe After Effects CS3 and while doing so I will get a error message saying I may only install one Adobe product at a time. Please complete the other installation before attempting to install Adobe After Effects CS3. I have previously installed the 30-day trial of the Adobe Premiere Pro and have had no problems with the product so far, it is running as it should be. I have tried restarting my computer and reinstalling the program several times and I continue to get the same results. If anyone could assist me it would me much appreciated.
Remove the apps with the CS3 clean scripts and install in reverse order (AE first, then Premiere). also make sure to run the installs with full administrative priviliges. The error usually only occurs if you don't have proper permissions and thus the install cannot create the timestamp files for locking activation.