How to set up a library for unity?

I forgot how early solved the problem. Searching the Internet has not led to a solution.
5c9cc6a2de8db420733735.jpeg
March 19th 20 at 09:02
1 answer
March 19th 20 at 09:04
Solution
Russian as usual there is no information, the benefit of the Europe knows it all. to update Windows you need, because this Assembly is not the library.

Find more questions by tags Unity Game Engine