Welcome to the community. 
First of all, I split your post into its own thread, since it was a very different issue to the thread you posted in.
.NET Framework is a very important piece of software that you will need for many other softwares to run smoothly on your PC, including WeMod and games.
Your solution is found under the last heading in this post: I can’t Install WeMod / "There was a error installing the application" - #2 by Ravenfyre.