Are you downloading via chrome browser?
Here is what i found that might help.
"If your Chrome downloads are stuck, it may be due to limited bandwidth, insufficient or a corrupted download cache. Ensure that you have a stable internet connection, clear your browser cache, restart your router or modem as well as your PC, and then try downloading the file."
Also only download on sites thats official like Itch, or Patreon if you are supporting the game. Other sites have pirated copies of the game, and can easily be corroupted.