Just re-downloaded both games and neither will start...not sure where to go from here. I had them running fine up to a couple of days ago...un installed everything including all gog programs....reinstalled and only rct3 works....Running latest windows 10 had an update to my native grafics card and now neither works Any ideas or support answers would be great

Try running the games in compatibility mode for Windows XP SP3 and setting them to run in 16-bit colour mode.