Thanks for your input.
Screenshot of the permissions and execute output:
Fixed it by copy the crelay file again from the source http://music-server.net/download/install.zip
Now the relays show up in the CLI "Detected relay cards: #1 HID API compatible relay card (serial 959BI)" and web gui "Found relay card - Serial: 959BI"
In the install.zip, seems the crelay file contains the string "arm" and the crelay_arm does not contains the string "arm" in it's content.
Maybe the files has been swapped during ZIP creation?
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