Hello there! Cracked versions of Among Us won't update, you need to download it manually (if you can, buy the game on steam, support the creators). If you are using steam version, it should update itself, if not automatically, you will need just to check the updates for Among Us in your library. Also, as player under the name 'sellersmd' said, "f you downloaded through itch.io, just click the little down arrow in the top right of your screen, click on My Library, then find Among Us and click download."