I recently upgraded to Lightroom 5.5 from LR for PC. I installed the program on my home desk top no problem. When I tried to upgrade my work desk top, I realized the IT guys had "upgraded" my computer and uninstalled Lightroom. When I tried to install LR 5 with the upgrade serial number, it naturally asked me for the original LR 3 serial number, which I cannot find. I recently moved so the disk is packed away somewhere and I can't access it throught he application at home, since it's now upgraded with the new serial number. I have the packaging for my original LR3 but the serial number is not there. It's also not on my Adobe page even though I registered it. How can I install my upgrade w/o the serial number? Or how do I retrieve this original serial number? Thanks.
If you haven't registered your serial numbers on adobe.com (easiest way to get it back) and as I am not sure what OS you have but if you have a look here Preference and other file locations in Lightroom 5 at the Serial Number you will find the original and new Serial number in the Lightroom 5.0 Registration file. This will be on the PC where it is installed and working.
Just use the one that is not for Lightroom 5 as the original, should be entries like: original_serial_number = (previous version) and serial_number = (lr 5)
That worked. Thanks for the help!