Premium License Key Invalid

After upgrading to Cuba Studio 6.7, I’ve needed to re-enter my license key a few times. When this issue occurs, I go to open a project, and I get an error message saying that my registration is invalid.

Could you share the screenshot of the message?
When did you register? Maybe, the license has expired.
Do you use Studio on several PCs at the same time?

I use the license on my work and home laptop, but not at the same time. I work from home on some days. Can’t reproduce the error after re-registering the studio license.