I have potentially lost my Project files because it "could not be compiled/rebuild source manually"

It looks like the debugging issues work momentarily except this time a new error message appeared.

It reads " Unable to start program C:\Program Files\Epic Games\UE_5.0\Engine\Intermediate\Build\Unused\UE5.exe"

The System cannot find the file specified

What does this mean? Do I have to install the unreal application to this directory? What am I missing?