When I installed 5.7 on the new computer and entered my original serial number (from LR 3) I get a big red X - serial number not accepted. What gives?
Your Lightroom 3 serial number will not be accepted by 5.7.
If Lightroom 5.7 is an upgrade from Lightroom 3 then you enter your 5.7 upgrade serial number followed by your LR3 serial number.
This is a user to user forum. You may even ask questions about LR 1, if you have one. I'm sure, someone will be able to give you a qualified answer.
As John says, you should also have a LR 5 serial number. You need to enter that (first).
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You first have to enter the LR 5 serial number and if it is a upgrade serial number another box will come up asking for a serial from a qualifying previous version. Then you enter the LR 3 serial number.
If you don't have your LR 5 serial number you can get it from your old computer. It is in a file on the hard drive.
C:\ProgramData\Adobe\Lightroom and look for the LR 5.0 Registration.lrreg file. There will be 2 serial numbers listed.
Original_serial_number which is your previous version
and serial_number which is for LR 5. This is the one you need.
Cross reference the other one with your serial for LR 3 just to make sure.
WRITE IT DOWN AND PUT IT IN A SAFE PLACE.