Hi!
That actually, while often the case with other software from github, is NOT the case with this one as there are precompiled binaries, see here from about mark 2:18 
So it is one click to download and to open
There are only two things to take care of. Your 3d model has to be in .obj-format. And when you save the file, it is mandatory to write the ending “.obj” at the end of filename, otherwise it will not save.
I would give it a try as it is free, gives great results and very (!) easy to use.
cheers