Somewhere along the line, you have downloaded and installed from the creative cloud. This could have been done initially by mistake, or you may have updated using the wrong link. This has happened to a lot of people. The solution is for you to uninstall that installation of Lightroom. Then you can install from here:
Doing this will not affect your images or any of the work you have done using Lightroom. After you install the right version you will be able to continue right where you left off.
I have intentionally avoided any CC stuff as I do not use any other Adobe software other than my standalone LR5.
Could this be related to the LR mobile functionality which is offered within the LR?
I might have enabled the mobile extension by accident.
Let me try your suggestion.
That's possibly the problem. Lightroom Mobile requires a creative cloud subscription. If you don't want the CC then Lightroom mobile is useless after the 30 day trial. But that shouldn't have any impact on the develop module. The only possible explanation for that is that you have installed the CC installation at some point. As I indicated before, this seems to be a common mistake.
Your method solved my situation.
Thank you Jim.