You could try to use Proton GE, which you just download, unpack and execute the proton executable in it. There are a few variables to set, but no administrator rights is needed. I wrote a little script years ago, which got a bit semi-viral (if we can call it that, but to me it was xD): proton script You need to read and adapt the parts, but at least you can see how this works. There is also a fork, who made an advanced version of it. I have no idea if these scripts work without Steam. But that is left as an exercise to the reader.