The Serial Number that you have is for Lightroom 3 , so it is only valid for the version LR 3.
In order to use Lightroom 5, you need to purchase an upgrade for Lightroom 5.
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Right the serial number for LR 3 will only work with LR 3. Not LR 4 or 5 or 6. You have to buy the newer version and get a serial for that version.
LR 5 is not an UpDate for LR 3. It is a Newer version and requires a completely different serial number.
Is it still possible to download lightroom 3 instead?
If you have the CD with you for Lr 3, then you may install it on your computer.
Thanks for all the help. Problem solved.