I purchased the LR5 upgrade disc to upgrade from LR3.
I tried the 30 day iCloud trial of LR5 to be sure it worked with my D750 raw files which it did just fine.
Now the trial expired but my copy of LR5 says I have to "Renew my membership to reactivate the develop module".
Since I "Own" LR5 it shouldn't be asking for a renewed subscription.
Look at the links to the right, under "MORE LIKE THIS", and/or search the forrum for the error.