Me too!
I bought my EyeTV 4 license 18 month ago, and all works fine, till today.
I installed EyeTV 4 (last release) on my new MacBook Pro M1 based on Monterey and from now on, my license was set to invalid. It doesn't work anymore.
Even if a second installation of my license is not allowed, there should be a process to deactivate the old installation, which is not need any more.