Please refer to the screenshot below.
I have CS6 Mastercollection. When I open Photoshop or illustrator (I didn't try other applications but probably will also result the same) it gives me pop up menu that I have to deactivate previous devices because I reached my limit.
The problem is I can't deactivate my previous devices because adobe website doesn't list any.
I can't access the "previous devices" because it's the same computer just did clean install.