When I try to open LR I keep getting A message stating 'Adobe Application Manager, required to verify your licence, is missing or damaged. Download a new copy of Adobe Application Manager www.adobe.com/go/applicationmanager' when I do this it states page is missing? I have no idea what has happened or why and when I click ok LR opens and I am able to use it?
Here is the link to download Adobe Application Manager :
It seems that somehow the link between Lightroom CC and the Adobe Creative cloud App got broken and thats why Lightroom prompts with that warning message on launch however it still allows you to access the program itself.
You can download the Application Manager from the link provided and update it to the latest version of Creative Cloud Application and that will resolve the issue.