Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.
I suspect he means the Develop module is disabled? That would be the case if the product wasn't subscribed to.
Check your Creative Cloud application, that you are logged in and it shows you have subscribed. You might need to reboot, that sometimes gets the CC application going if it isn't. Otherwise, you need to contact Adobe and find out why they feel you're not fully subscribed.