I own lightroom 5 on my desktop, I have downloaded it on my new laptop, but I do not have the registration code from my update. The code is from lightroom4. How do it get the number so I can register it on my laptop?
If you own Lightroom 5, you received a serial number for it, that is what you want to use.
If you don't have it any more (not a good idea, by the way), you should be able to find it via: Find your serial number quickly
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