Sorry if i sound rude! But some people dont know how rar files work (i am one of those people lol), i hope i am not bothering you! Have a nice day ^^
Also if you cant/dont know how to make it a zip file thats okay too! Have a good day/night.

i dont think the developer is gonna respond so the only way i know is to use WinRAR and 7zip(i don't use 7zip so idk if it can extract rars)