…When I attempt to open the file ‘frd.jar’ a pop up says “frd.jar is damaged and cannot be opened” bearing in mind I’m using a Mac.
I’m not a Mac expert. At all.
Maybe your java isn’t installed properly? And even if it is, maybe your system doesn’t associate ‘jar’ files to open with java correctly?
Can you open a shell prompt, go to the folder with the jar, and type something like
java -jar frd.jar
?