Where to add the S/N of a new installed Tonlib_Gfx App??

Hi friends,
I had to completely re- install my LINUX.

I used a registered Tonelib-Gfx V4.8.7 on my old system!
When trying to use it now on the newly setup LINUX (wine / yabridge installation as on my old system) it only opens the "test-version"!

I found the S/N of the "old installation" , but how/where can I add it to my newly reinstalled TL-Gfx??

TIA
greetings from Hungary
Didi

btw.:
Love that GFX and used it on many Songs in MuseScore!! Hope you can help!!