Can’t run client on macOS (miss execute access to files)

I've been playing xMage on the first versions of the client for many many years until now. There are just too few players on the German server for example.

They told me to get the BETA where new cards are still added. I downloaded the client, unzipped it and tried to launch the launcher. But nothing happened (I waited 3-4 hours). Why? I can still launch the old client but not the BETA one. Do I have to change something else, too? Got the newest JAVA so I don't know what to do...

Start by reproducing the BETA client launch failure on macOS using the downloaded client and launcher, with the reported Java version. Check the launch behavior and file execute access, then confirm the BETA client starts successfully without affecting the older client.

Written by the indexing model from the issue text.