Modding and RPG Maker VX Ace Lite (which doesn't work on my current PC).
Before 2011, there's also Legendary Tales (v1.6 and also what Kim used to make a current Tirahnys map in August 2020) and RPG Toolkit 3.0.6 (Dragon Riders Continuity Koppa started here!) and Adventure Game Studio, but those first two have issues on our current PC (sound causes slow-downs or crashes for the Toolkit; Tales crashes a bit on Windows 7, it seems).
RPG Maker, huh? It sounds like you're further along than I am in regards to game design. (Perhaps one day the Lunar Shadow RPG Bloom and I came up with could actually be made once you finally manage to get RPG Maker VX Ace Lite working in future?)
That said, Legendary Tales and RPG Toolkit sound like alternatives that may be useful though it's quite unfortunate that you and Kim aren't able to get it working.