I have upgraded James Quest: Remastered, Demo 1st Quest, and Demo 2nd Quest to 2.50.2
James Quest: Remastered is a straight port with a few bugs fixed.
Demo 1st Quest and Demo 2nd Quest got a few new bells and whistles as well as being upgraded. (custom guys, Z2 life meters, compass beeps, and a buff to the Lv. 7 Aquamentus in Demo 1st: Now you can't block his fireballs)