😱 Thank you for the report! It looks like it’s a security issue that might have to do with how I’m signing the Mac application at the moment.
I found a workaround: you can open the Terminal and run this command on the .app file after you extract it:
xattr -d com.apple.quarantine "Upheaval.app"
I’ve tested this on my Mac computer and it seems to work for me (I found the same problem as you, actually). Let me know if this works for you, or if it doesn’t work (in which case we’ll try to find another workaround).
I would love to make a proper fix ASAP, but I’m also working on a number of other features right now, and I realistically won’t be able to work on the Mac signing until later this year, unfortunately. ☹️ Thank you so much for your patience, and please let me know if you notice any other issues! 😄