Environment: MAC user OS X Yosemite V10.10.2 purchased full license for Lightroom, current version 5.7.1. I have been using Lightroom for several years.
I downloaded Lightroom Mobile and Creative Cloud was installed and visible on the top information bar. I didn't use the Lightroom Mobile app and no information uploaded to the cloud.
Problem: Creative Cloud shows Lightroom is being used on a 30 day trail. It has now expired and my Lightroom full license version has stopped working with the above message Lightroom Development Module is disabled. I purchased the full version and have a license key but not able to get it working again. HELP please.
The develop module being disabled is indication that you are using Lightroom that was downloaded from the creative cloud. It cannot be used with a serial number activation. It will have to be uninstalled, then you can download and install from this link: Adobe - Lightroom : For Macintosh
After you make the change you will be able to start Lightroom normally and continue working with the catalog you have been working with.
Greatly appreciate your assistance and in providing the link. Lightroom is up and running. Thank you