This PlugIn doesn’t work

I downloaded the free version to test. But on my wordress seite I get the message:

“You changed a license type for Social Locker. But the license you use’re currently requires another plugin assembly.
The plugin won’t work fully until you download the proper assembly. Don’t worry it takes only 5 seconds and all your data will be saved.”

And I can’t even update or re-install it. So something went wrong with this PlugIn

any suggestions would be great.

The page I need help with: [log in to see the link]