Had issues with getting Project Libre to run on my Mac, like everything would download fine but nothing would happen when I tried to open. A lot of suggestions about changing security preferences but these are all out of date as you can no longer change these, but also these are irrelevant to what needs to happen.
You need to download Homebrew in order for it to run on your Mac. I am not super technical but I tried to open Project libre in Terminal, then pasted the code and error into Chat GPT and had it analyze what to do. It provided me with the entire code I needed to run to install Homebrew and then once I downloaded it fully, I reopened Project Libre and it worked.
If you are able to download Project Libre fine, and it just won’t open or do anything, this is what you need to do.