I just stumbled upon this on Facebook, a Windows and MacOS trojan.

It's kinda sad really, something funny though is they just copy pasted stuff over, so the home page still talks about the official page and the documentation still states Rainmeter is a Windows only app
Anyways, the installer is - as you'd expect - fake!
There's also the case of sites that free boot skins, like that VisualSkins site, or straight up remove credit and modify the files like that Rainmeter-Skins site.
There was also the case of Chocolatey, but since silent installer got added, they just made it a glorified command line for that.
The only thing I can sadly do is just report all of this to https://safebrowsing.google.com/safebrowsing/report_badware/ , for the cases where we can't it would be nice to at least inform publicly what's there I suppose.