Also, kumarin instructions are outdated. You can skip "remove MelonLoader step", because this problem is solved.Running the .bat to remove melonloader seems to do nothing while it flashes for a second to say file isn't found.
When trying to run the game after patching all at once, the window doesn't show but the game is running in task manager. Opening the game then running bepinex sets into a download loop, before crashing a few seconds later. Am I doing something wrong?
Otherwise, you may need to change locale/use locale emulator (or maybe run as admin should be enough), as you will have a messed up/fixed camera and then it resembles classic tank controls games.
Also check your firewall/AV. It may be blocking the game or BepInEx.