What exact version of the OS are you using?
What part of the install or resistration process is not working?
What error message are you getting (exact text)?
Thank you for the response. I'm running OS Yosemite. I come to the place where I enter the product registration number, enter the numbers, but the screen will not advance. No error message. I click to go back, but same thing happens.
Given how old LR3 is, I am not surprised that you are having registration problems.
Unfortunately, I can help you any further.
Thank you for trying. I actually am planning to upgrade either to the cloud or to 6. It's just that I don't want to lose my catalogs I have accumulated over the years. Again, thank you.