Lost serial numbers Rf 5.5 .Can anyone help. How to recover it?

Horizon Support might be able to help, but you'll have to be able to verify the other information you used to initially register it years ago.
I say MIGHT, because back then the product was supported by Knife Edge Software, and it is not known to us here how well the old registration information was transferred to Horizon when they bought it. Unfortunately, if it was easy to get the numbers, too many would be trying to find a way to get a free copy.

Try here: https://www.horizonhobby.com/contact/

You'll need to have the Interlink controller or equivalent, that has its own separate serial number also. If the one you have is not the same as the one that was originally registered with the software, that may make it even that much more difficult to get the main serial number. Horizon can advise on that.
The software is 15 years old, so it may not run very well on a newer machine. It likely is time to just get the latest version, no matter what.
 
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