Remove your serial number from the post. This is a public forum.
If the license was for an earlier version 4 or 3 it will not work for LR5.
If this is the case then you will need to purchase a upgrade license key.
It appears to me that the serial number you've posted above is indeed for an upgrade to version 5.x from an earlier version. You'll need the serial number from the version you previously had also (ie: version 2.x, 3,x or 4.x).
As already stated by DdG you shouldn't post your serial number here.
Thanks - this really helps, at least gives a starting point. Unfortunately I have not kept the original version number - any advise how I could retrieve it?
And, one more help please I see the relevance of your point re the serial number, stupid of me to have overlooked the forum being public... It doe not let me edit/delete the post as there re replies to it... Is there a way I can ask for moderator help here? Searched the menu but could not find my way around...
Cheers, for helping out a first time user here!
Found the serial number - loaded ok, and found a way to apply to admin. Thanks once again - your guidance has been my way out.