We need our designer to work on both Mac and PC. So far, we worked mostly on press items, but now we are getting into the interactive development are. Our head designer needs to do the creative work on a Mac but also review and adjust on his Windows PC before submiting the file to the developers.
The designer will NEVER work on both PCs at once. We already own a license for CS4 Mac and several CS4 Win, but find unfair to have to buy an additional CS4 Win just for this case. If it was another Mac, we could do the install as long the the 2 installations are never used simultaneouslly.
Any idea on how to solve this?
Well, as you know, you can install on up to two systems of the same platform, so long as you dont use them at the same time...
But section 2.10 of the Adobe CS4 licensing agreement (section 2.11 for CS5) is pretty clear that you can't mix-and-match across platforms.
You might inquire with Adobe customer support if they can help you in any way, but that's the way it is right now, for everyone.