Your old saves won't work anymore with the current version. also make sure that your java is up to date
I have deleted the old game, the Java link you have on this site is the one I have installed, and it keeps getting me that message, are their anything else then Java you need to have to play the game?
windows 10
I use windows 10
have you properly unzipped the game and made sure the folder is not on read only? if so, i am afraid i cannot help you