License error in cubase - A required license has been disabled

Hi

I purchased Absolute 4 about six months ago & Vibrant about 1 month, I never had any license issues until recently when I downloaded free versions of Engine Roar, Guitar Harmonics, Novel Piano & Alto Glockenspiel.

I’ve recently been getting the following sporadic Elicenser error messages for Vibrant & Olympus choir even though I own both licenses & both are registered.

“A required license has been disabled. Please verify your local date settings and start the “eLicenser Control Center” to validate the license.”

Can someone please help me fix this issue?

Many Thanks
Steve