Unfortunately, all of the advice I’ve found so far is basically to move the game files somewhere, re-install the game from within the Epic Games Launcher, pause or cancel the install, copy the game files into the target location, then resume the install or verify the game files. I installed a bunch of games when I first built my new workstation, before I built a VROC RAID0 of M.2 NVMe SSDs, and wanted to move all of the games to the new large and fast storage array. A lot of folks on the net seem to be interested in moving games from the Epic Games store from one drive to another, usually because they’re running out of space on their disk or they want to move the game to faster storage.