You say you had to confirm replacement of files when you extracted the HBAO fork, so I’m guessing you’ve extracted the zip into a previously downloaded or installed copy of UE4? That would explain the duplicate modules in different locations, you need to extract the HBAO fork into an empty folder.
Seems like error CS1583 can occur due to insufficient space on the drive, so maybe check if you have enough free space left on C:. If that doesn’t help, try moving the code out of the “Program Files” directory, preferably to a path that doesn’t contain spaces, e.g. “C:\EpicGames\UnrealEngine-HBAO”