I only found out that I should have uninstalled Lr5 before updating. I have updated my catalog from Lr5 to Lr6 and am using Lr6 now. Can I simply uninstall Lr5 via Windows Control Panel>Programs and Features? Or do I need to uninstall Lr6, then uninstall Lr5 before re-installing Lr6 again?
The Help is not very clear on this. This is what it says in the creative-cloud/help/install-apps page:
"Important: You can have multiple versions of Adobe applications installed at the same time. If you plan to remove a previous version, uninstall the previous version before installing the current version."
But it does not say what you should do if you have installed Lr6 on top of Lr5.
You can uninstall LR 5 from Control Panel>Programs and Features and let LR 6 be there as it is.
Let us know if you need further assistance with this.