i cannot play because is running an older version. how do you update this game?
If you're on mobile, then update from the App Store or Play Store. If you downloaded it from here, you're a FUCKING idiot you should've downloaded it from Steam, but I'll still help you.
Downloading and playing:
Download the .Zip file, right click and click EXRACT ALL. Look in the files you've extracted till you see one with an icon of the red Among Us dude.
Updating:
Re-download the file off this website and delete the previous version.
PS. The reason I said you should've downloaded it off Steam is that it's easy to update and much easier to download.