A few months ago I paid for the game on my brother's computer because it didn't work on my Mac. Shortly after that his computer broke so I was unable to play. I'm now using my dad's computer for it but it's making me have to pay again. Is there any way I can still have access to the game without having to pay a 2nd time? Any help or answers would be appreciated, thanks.
If you bought it through Steam, just sign into steam on your new PC and re-download it. If you bought it through Humble Bundle, sign into your humble bundle account and go to your purchases, select BeamNG and download it.
In no case you have to buy the again, if you already purchased it once. You'd need to specify from which store you got the game from (Steam? Humble Bundle?) If Steam: You just install Steam on your new PC, login with the same account, and all the games you own on that account will be ready to be downloaded and installed. If Humble Bundle: The link to your download page, that Humble Bundle sent you when you bought the game. If you lost it, use this page to retrieve it: https://www.humblebundle.com/resender (you must insert the same email address used when you bought the game)