My Mac Air won't update because of Epic Games Launcher!!!

I provided an embedded link to the Safe Mode instructions in my last post, it is the "Safe Mode" text highlighted in blue. I'll repost the link here:

How to use safe mode on your Mac - Apple Support

FYI, technically you do have third party software installed....the Epic Games Launcher, but I'm assuming you mean the other unneeded & troublesome apps. You can run EtreCheck and post the report here which will give us an idea of your system's configuration and third party apps which automatically launch during boot & login as they are the ones which are most likely to cause a problem....I'm guessing the Epic Games Launcher is one of those apps which is always running in the background.

Have you tried quitting the Epic Games Launcher manually? Some apps may need to be manually terminated, or at least not have certain areas of the app being accessed.

You can try Force Quitting the Epic Games Launcher.

You can try booting into Safe Mode to see if you can perform the updates.

I would not expect the Epic Games Launcher to have this issue, so you may have some other third party software installed which it interfering with the normal operation of macOS and the Epic Games Launcher. Anti-virus apps, cleaning/optimizer apps, and third party security software are known to cause all sorts of issues, so if you are using these types of apps, it is highly recommended you uninstall them by following the developer's instructions.