I have the same issue on Windows 10.

[tihon49]

I have the same issue on Windows 10.
I have tried all Python versions although no difference.
Tried many ways of installing Visual Studio although no difference.

Originally posted by @marboe123 in #47 (comment)

[tihon49]

take the file you needed from here: https://www.lfd.uci.edu/~gohlke/pythonlibs/#ujson
in my case it was: ujson-3.1.0-cp38-cp38-win32.whl (although I have windows x64 version!)
then enter in terminal pip install ujson-3.1.0-cp38-cp38-win32.whl