Ah, sorry I missed that you said you have tried to reinstall already. If you reinstalled with the latest download from your Spine license page, then it should not show that dialog anymore. I tested this again just now and it's working correctly.
Could it be that you aren't reinstalling the latest? If you are on Windows you should see Spine Launcher 3.8.81
in the title bar during installation:
Loading Image
Also when you run Spine, your spine.log
should start with:
Spine Launcher 3.8.81
Esoteric Software LLC (C) 2013-2020 | http://esotericsoftware.com
...
You can find your spine.log
here:
Windows: <user home folder>\Spine\spine.log
Mac: <user home folder>/Library/Application Support/Spine/spine.log
Linux: <user home folder>/.spine/spine.log