Yep thats great.
Can you try running "spctl --remove /Volumes/OpenLP/OpenLP.app" then "spctl --add /Applications/OpenLP.app/" and then try launching OpenLP with Gatekeeper enabled?
Can you re-enable Gatekeeper and run "spctl -va /Applications/OpenLP.app/"?
Also can you run "spctl --list"?
And another can you run "ls -l /Applications/OpenLP.app/Contents/"?
If you run "xattr -l /Applications/OpenLP.app/" and take the first block of output e.g. 0001; or 0021; and replace the third number with 6 e.g. 0001; would be 0061;. Then run "xattr -w com.apple.quarantine <your modified string wit…
Can you try deleting OpenLP and copying it again from the dmg? Then run "xattr -l /Applications/OpenLP.app/" before and after trying to open OpenLP and post the outputs.