Hi - posting the solution for the benefit of the community.

In this situation, I had to go to "Turn Windows  features on or off" and then tick on .NET Framework 3.5 (includes .NET 2.0 and 3.0). Once I did this, I rebooted the laptop and the installer that was not completing completed the install upon login.

I appreciate the time and advice offered by the poster yesterday. I'm an IT guy and eventually made my way over to checking on this setting, I picked this issue up after the bookkeeper had it and somehow left it in this situation.