itch.io

4$ is barely anything for a pc game you should be able to buy it

you shouldn't have to buy the game again unless you refunded it

If you are on Computer and you want to update:

1. Go to the Among us steam page (https://store.steampowered.com/app/945360/Among_Us/)

2. Click the gear icon

3. Click Properties 

4. Click Betas

5. Click NONE- Opt out of all beta programs

6. Click public-beta - and you should be set!

Does your internet work well when playing other games ? if so then its probably among us servers having issues , and you might want to switch regions temporarily

The beta updates are only for people who bought the game on steam