Today i made an update of Better Touch Tool on MacOS Catalina 10.15.7 (macBook Pro 16" Intel)
Now the App does not start anymore. Possibly not kompatabible with the System? There was no warning about inkompatibility. Is it possible to go back to the older version? The actual (not working) version of Better Touch Tool ist 4.139 ...
Same results on same OS.
Scouring for old versions now. 
Same here. I use Catalina as well. I wish they tested their updates before rolling them out.
I have recovered an old version and turned off the automatic updates, now.
Weird, could somebody of you post the crash log or send it to andreas@folivora.ai? (console.app => user diagnostic reports)
It works in my VM, but I don't have a real machine running that OS anymore.
I think I found the issue. Apple accidentally marked a function to be available on 10.15, but that is apparently incorrect.
Should be fixed 4.140 https://folivora.ai/releases/btt4.140-2354.zip
4.1.40 works like a charm for me. Thank you very much for the incredible turnaround time!
Version 4.140 solved the my problem and starts proper. Thanks for the Immediate bug-fix.
Thank you very much, Andreas!
Late to upgrade/confirm, but you've made my geriatric iMac (and me) happy once again. Thank you.
Probably safe to close this out soon...