Unable to install newest Ninjatrader8 8.1.5.0 verison?

Hi,

I had NT8 installed and working fine. Then I was prompted for an update so I decided to update. Well, NT8 did not update. After not being able to update, I had uninstall NT8 and reinstall. When I reinstalled NT8 I got this error message. Not sure what I need to do. Any help is appreciated. Thank you.