I have lightroom downloaded on one computer already. I also have the serial number for that copy of lightroom. Now I am trying to download lightroom onto a second computer (my travel computer), which I understand I should be able to do. Please help me with this!
Exactly what is the problem?
I have logged into my Adobe ID account no problem and gotten to the My Products section of my account. I then go to Register New Products under the copy of Lightroom that I purchased and type in the serial number. But at this point it tells me "This serial number has already been registered". I don't know what I'm doing wrong exactly, but I am under the impression that I am legally allowed to register a second device on the same copy of Lightroom.
I hope that adequately explains my problem.
You are legally allowed to use the serial number on a second computer (given certain restrictions). This has nothing to do with registration.
Download Lightroom to the 2nd computer and install it and apply the serial number.
Once your serial number is registered there is nothing more to do, it can be used on two installations but not simultaneously. So, one registration allows for two installations.