When I tried to install Build 863, I received a message that it could not uninstall older version. The older version is build 813.
I tried both manual and by using Windows Uninstall function - several times. I received the following error message.
"Windows Installer: The feature you are trying to use is on a network resource that is unavailable. Click OK to try again, or enter an alternate path to a folder containing the installation package 'install64.msi' in the box below."
The file in question is not in any drive or folder on my PC. I think it is looking for the original install which may have been before I had to reinstall Windows.