Hi vlag,
Thank you for the response! Still unfortunately no luck, double clicking and no launch.
I did get the message below in the terminal, so thought it may work:
Usage: /Library/Developer/CommandLineTools/usr/bin/install_name_tool [-change old new] ... [-rpath old new] ... [-add_rpath new] ... [-delete_rpath old] ... [-id name] input
Not sure what I am doing incorrectly, it isn't very clear for Mac users - I have downloaded Zelda Solarus DX, which seems to have the libluajit-5.1.2.0.2.dylib file inside, and that launches fine!
Perhaps I should wait until there is an update which fixes this