The launcher cannot complete installation

By the way the launcher is called “EpicInstaller-6.2.0.dmg”
-GavOnyx

I’ve downloaded the launcher on mac and open up the epic game launcher app. then it will download an update and and once the download is complete, the window will close for a few seconds, then open up again, this time saying completing download. that window stays for about 5 seconds before closing again, and then opening with the same message 10-15 seconds after closing. It repeats this about 5 times before finally opening a new window telling me that the program has crashed. How do I get around this? and why is it happening?
awaiting your response.
-GavOnyx