I found it i had the same problem so i went to my folders i deleted all folders and reinstall it but DON’T PAUSE OR CLOSE EPIC GAMES WHILE ITS DOWNLOADING cause thats causing the problem just let it run until its finished
So I was having this issue and from what I can tell it is actually still installing but the installer is broken and shows 0 write speeds. For me this was happening as I was installing it on a slower HDD so it finished downloading and then took a while to catch up writing it all onto the drive. You can use Task Manager to make sure it is actually writing to the drive but for me after waiting a while for it to finish, it moved on to verifying.