please see >>> http://helpx.adobe.com/creative-cloud/help/install-apps.html here >>> How many computers can I install on
I quote: You may install software on up to two computers. These two computers can be Windows, Mac OS, or one each.
If you install on a third computer, it will request you to de-activate on the other two computers. You can then reactivate one of the previous two computers, and use Creative Cloud apps on it.
What concerns your CS4, that's no problem to use them further on, like I do with my Adobe Web premium CS4.
Thank you, so I can continue to use CS4 even with the CC subscription. That's what I wanted to know!
you are welcome! An additional security: your/our CS4 can be installed from a disk and so my programs and I we have brought already quite a lot of relocations behind ourselves during the last time.
P.S. Thanks for your little green star!