I've just purchased the full version of Lightroom 5.4 & have entered my serial number, however, I'm now being asked for the original trial serial number which I don't have.
I have tried to locate the information on my Adobe account, but the only thing that shows up is my full version purchase.
Any ideas where to find the trial version serial number, as without this I'm stuck in Limbo !!
If you purchased Lightroom, you should have received a serial number somewhere
If it is asking you for the serial number of a previous version (version 4, 3, 2 or 1) (not a trial version, it shouldn't be asking for that) then you didn't purchase the full version, you purchased an upgrade and you cannot use Lightroom without the serial number of that earlier version. If you purchased the upgrade by mistake because you never had a previous version, and you should have purchased the full version, then you need to contact Adobe to sort this out.