If you purchased the Perpetual Licensed version of Lightroom and received a 24 numeric serial number you will have to download the correct version from the link below.
Before doing the new installation you will have to uninstall the existing version from your computer (it is the Creative Cloud version) since it is requesting you to "renew your membership" . This process will not interfere with your Catalog file, Preferences or your personal files, it will just remove the existing application. Both versions are the same application just a different download and activation process.
Reboot your system then run the install of the Perpetual License download and input the serial number to activate. Things should be fine.
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