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Hello.
A very long time ago I bought headphones from Razer.
There was attached a code for paid activation.
I deleted the program, and installed it again, but I enter the same code, but it says to me that it is not valid.
Did you registered the devices to your account?
xCryptik
Did you registered the devices to your account?

Yes
Need to find out "what is the model of your headphone?"
And see what Synapse app supports this device

The below is a link to Synapse 3, and also lists what Razer devices it supports
https://www.razer.com/synapse-3

If your headphone is old, possibly Synapse 2 might support it
https://www.razer.com/synapse-2