Hmmm I haven't heard of the downloaded version doing that before. The online version does that a lot since it's not as maintained. Just make sure you are downloading the right file (Windows, linux, etc.) and have your virus detector off when you download it (Some virus detectors delete the game thinking it's a virus when it isn't). Other than that you might wanna take your problem to the discord since I have never heard of that happening with the downloadable version. Sorry to hear you're having trouble :(
(P.S. The game isn't compatible on mobile devices and if you are using a chromebook I think you have to do something special, ask the discord if you are using a chromebook)