Problem: Digimarc Plug-In not to be installed in Photoshop 21

[s-stiller]

Hi,

I have upgraded from Photoshop 20 to Photoshop 21. With this my digimark Add In disappeard. I have tried to add it again with Creative Cloud Desktop. And here it is also shown as installed, as well as 2021 calendars. But also after restating Photoshop no Add-In to find within. Neiter under menu Filter nor menu Plug-In.

How can I get this Plug-In back??

Thanks Stefanie