Looking for "Receiver" by Wolfire Games

Anyone know where to get an up-to-date copy of Receiver from Wolfire games? The first one, not the shitty sequel. Can't find any version newer than 2019. Game still receives updates. I know its source code is on github, but that requires a copy of unity. Not about to download a whole ass game engine just for one game to compile.

Just want to be able to use a few mods on it that only work on the latest version. Still stuck on "rc7" version from ages ago.