I purchased Lightroom 5.7.1 in late December and now it is telling me that the Develop module has been disabled and to purchase a license to reactivate it. I'm not a member of Creative Cloud so if I ended up accidentally updating that version, I still can't get the develop module to work even after I've uninstalled Lightroom and installed the update version from the link that I've seen being provided in other discussions. Help??
Even though you purchased a license for Lightroom, you have installed the creative cloud installation of Lightroom. It cannot be activated with your serial number. It would have to be activated with your Adobe ID and password. You will have to remove that installation and then install from one of these two links: