For moving the Steam version then, refer to that same
Moving a Steam Installation and Games on the Steam Support site, linked to in that other thread also.
I realize it can be frustrating dealing with this #$@!%, but it really is a good set of games, once you get used to the hoops needed to jump through, and the pitfalls to avoid. The owner's manual for the game is sadly lacking on basic information, but again, mostly due to the games' ages.