I have the game at version v2.1.0.3, which only have normal mode (not hardcore). Can I submit runs on this version? I don't know if between this and the latest version there are other changes as well.

Sorry for the late reply, running the game on normal is fine unless of course you would like to run a new category such as Any% Hardcore. v2.1.0.3 is perfectly fine unless u can update your version of the game. Thank you for asking!