How Can We Help?
It sounds like you need to re-install your .net.
If you’re clicking on the button to update, and nothing is coming up, it’s a .net issue.
If you just re-install from the link below, it will fix whatever file has become corrupt and allow you to register/update.
Just make sure you re-install and not repair, because it will ask you which you want to do:
https://www.microsoft.com/en-us/download/details.aspx?id=30653