Not the OP, and this is an old post but here goes:
I for one own early versions of CS, which still work on modern computers. To remove the ability to use said programs because adobe cannot manage to keep a registration/activation server active is ludicrous. I paid for perpetual programs, and can no longer use them on my computer of choice because of this. That on top of Acrobat DS literally force deleting full versions of Acrobat Pro that were bought and paid for.
If a person owns a copy of CS4, Adobe should not be cutting off the use of those programs. Full Stop.