Have to develop module is disabled, you have installed the creative cloud version of Lightroom. Either your creative cloud subscription has expired, or you have mistakenly installed the wrong version. If you have purchased a standalone license for Lightroom 5 then you can download from this website:
After you install you will be prompted for the serial number that (hopefully) you have. It is six groups of four numbers, the first four numbers are 1160.
If you purchased the Perpetual License key and have the 24 numeric key, then you probably have the Creative Cloud version installed which is paid via a monthly or annual subscription.
You will need to uninstall this application using the normal uninstall process.
This will not affect your existing Catalog File, Preferences or personal files, it will just remove the application.
Download the Lightroom installation package from the link below. Reboot your system and then run the install package and input the license key to activate.