My serial number is locked

 I purchased the program disc for Photoshop Elements 10 years ago.  It has been activated and registered to me and I have never had an issue up until now.  When I went to open the program I received an error message saying I needed to deactivate the program from my other devices to resolve the problem because I am only allowed 2.   I never had that happen before so I checked my old laptop and deactivated it and deleted the program.  I'm still getting the same message and it will not allow me to use my Photoshop.  I have been using it on my current laptop for years without issue until now.  I tried reaching out to Adobe and could only open a chat line with them.  They no longer offer support for PS Elements 10.  I tried explaining I do not need support for the program, just need them to allow me to activate it since it is not allowing me to use it for some reason.  All I am getting is a sales pitch for a subscription for a newer program.  Mine worked just fine until they locked it for some unknown reason.  Why and how they could do this is confusing.  If it was unable to be activated due to too many applications, it would have disallowed me to use it on my current laptop long time ago.  They should not have 'locked' the use of my serial number.  What can I co to resolve this?