I just downloaded 0.9.19 (https://github.com/logseq/logseq/releases/download/0.9.19/Logseq-darwin-x64-0.9.19.dmg) and it tells me “Logseq” is damaged and can’t be opened. You should move it to the Trash..
I’ve deleted it and re-downloaded it a few times, quitting logseq beforehand.
I have an Intel-based iMac 2017 running up-to-date 12.7.
Hope it’s a quick fix!