itch.io

create an account to update the game

If your pc gives you a warning and the only option you have is "don't run", press "more info" so it can give you access to "run anyway" and to be able to play the game.

If you already have the game, make an account in itch.io then verify your email so you can access your library. you probably bought the game without an account but as long as you use the same pc in which you have the game in, your itch account will notice it and you will be able to download the latest updates.