Hi,

what I found to work (at least in my case) is tp prepare the mac
application bundle with all packages and dylibs needed. Then, I do the following

puts "++ removing extended attributes and code-signing the app ..."
exec touch $exeFile
exec sudo xattr -cr $exeFile
exec -ignorestderr codesign --force --deep -s - $exeFile

$exeFile is the .app file (which is actually a folder in disguise). I
use a self-signed signature for this, so no developer account and no
money for Apple.

This works most of the times. I have some individual users where it
still gives problems and I think this may be due to individual settings
on the user side or because the upgraded to some macOS version where constraints got tighter, as already mentioned.

Having said that, the only proper solution is to get this developer
account, pay the money and sign the app with the certificate you get
from Apple.

Cheers, Torsten

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