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jlwilm » Sun Jan 24, 2010 8:54 am
Based on my CS3 experience, yes you can install CS4 on two systems, and actually on more, but Photoshop CS3/CS4 requires activation to operate and your licence can only be active/activated on 2 systems at a time.
If you want to switch activation to another computer where you have had it installed, you do a Help, Deactivate, then go to the other system and do a Help, Activate.
So, basically, no problem having installed and running (activated) on 2 systems. Best though to deactivate before un-installing or removing from any system - to avoid the long phone call and wait session with Adobe.