Just contact Adobe Customer Service and ask them to deactivate one of your activations.
Supplemental and for your convenience....
The following link would be expected to put you in contact with Adobe Customer Service/Photoshop Elements whose rep should be able to resolve the issue for you effectively and quickly.
Thanks it works again
Op dinsdag 26 januari 2016 heeft A.T. Romano <firstname.lastname@example.org> het
How to sign off photoshop elements on a crashed laptop? created by A.T.
Romano <https://forums.adobe.com/people/A.T.+Romano> in *Premiere
Elements* - View the full discussion
Great news. Great job of follow through to gain your success.
Best wishes with your Photoshop Elements projects.