Artlantis 4 Deactivated but will not activate again

I have deactivated the Artlantis 4 Studio Licence trying to move use it on another machine. Deactivation was OK, but activation fails on both the old and the new machine. What can I do? Please help, I have the newer versions but i desperately need this old one.

Hello,
please contact the support from https://artlantis.com/en/support/

Best regards,