Why do I get the "Epic Games Launcher is unable to reinstall due to a previous installation" error when trying to install the Epic Games Launcher?
There are a number of things that can cause this issue.
Try downloading and running the Microsoft app Program Install and Uninstall troubleshooter. It can be downloaded from this Microsoft Help site: Fix problems that block programs from being installed or removed
Once that has been downloaded and run, try installing the Epic Games Launcher again.