Following Na1den’s suggestion, I have managed to get 4.23.1 to install. It did not work once, then did later, including some relaunches and restarts.
Note:
- Still is not on primary drive, so still on D: drive, so that didn’t make a difference
- Moved it out of the default Program Files \ Epic Games .…(where it wasn’t working) to a Program Files \ Epic2 (where it now is working)
Though other attempts hadn’t worked before, so I couldn’t tell ya what changed. - Every time it failed on install previously I did notice that the install attempt had left behind directories and files that weren’t deleted, so perhaps there are unnoticed or hidden files that are not deleted after previous uninstalls that then cause the file system hiccup and create overly lengthy file names.