Here I uploaded the Lib and Scripts folders of a Rasa virtual environment, you can download them and extract them in the root of your virtual environment folder
Rasa Version : 2.8.0
Rasa SDK Version : 2.8.0
Rasa X Version : 0.41.2
Python Version : 3.8.0
Operating System : Windows-10-10.0.19041-SP0
@ChrisRahme Thank you for sharing the files. It seemed to be an error with build tools installation which was fixed after a reinstallation. I hope the files shared will help others!