does it say "macOS cannot verify that this app is free from malware"? if you right click+open the app, you should get a different popup which lets you choose to open it anyway
Try right clicking and selecting 'Open' from the menu, if that doesn't work, you should be able to go into your system settings from the apple menu and allow it to run from the 'Privacy and Security' menu. Hope this helps!
It gives me this if I open it, I can't figure out a way to get it to open.