I dunno what's up with that, then. This game has become such a headache for one reason or another that - till last night - I hadn't bothered cranking it up since June. Months-long gaps like that started becoming more and more common after "Strangerville" dropped, but I coulda sworn I had to switch to the Legacy Edition long before November of last year.
Maybe I DID mistake when the modular stair update dropped as a result of one of those gaps between playing. At this point, I have no idea. I just know that I won't bother spending anymore money on it, even if I DO upgrade my software in the future. I'll just build like I always have since TS4 dropped, or I'll go back to TS2 for my best ideas since I have the necessary build tools in THAT iteration without having to beg and plead for them, or the things to run that version of the game so I CAN have them in TS4.