Looks like not everything is back. I'm running EyeTV 4.0.0 (8526) on MacOS 11.6.5 with no EPG despite various attempts to clear things out and reload. I was using EyeTV Premium EPG NA just fine until recently. Choosing Check for Updates says I'm on the latest. I had a glimmer of hope when I saw build 8527 on their download page:
https://www.geniatech.eu/software/
which downloaded a disk image named EyeTV4.0.0_8527.dmg, but once I got the app out of the disk image it was still 8526. Anyway, hopefully this will get resolved for all users in all locales soon.