Burning Motor is available through Opera Gx's games page, or through direct download from the devs Itch.io page.

Important: If you want to play in the 1.13 category, you have to download it from itch.

Latest version on Opera GX: https://gx.games/games/xhl9nu/burning-motor/

Edka's Itch.io page: https://edka.itch.io/burning-motor

Note: I have noticed that for whatever reason, 1.13 is not available on itch as of the time of this post. I have posted the file in the Burning Motor Discord server:

https://discord.gg/B84YYKAeUH