When I bought that mouse, Razer Diamondback RZD-1600, drivers could be downloaded without registration, then 1-2 years later, it was not possible any more to download their driver without registration and email. That get me really mad at them and frustrated.
It was about 10 years ago, or so, but I still remember that filling.
Glad to hear they give up to that practice, and now they don't force people to register. For me it's too late. Been burned once, and I'm not using Windows any more. Also, I wouldn't trust drivers downloaded from a 3rd party, but that's a different topic.
I've looked today out of curiosity, and my model, Diamondback RZD-1600 is not listed anymore. Probably they have unified drivers and current driver will work for all models. Or probably not, because it sais "
Applicable Models RZ01-01420". So not thrilled about unlisting older models either. For the paid price I would have expected that to be different. I still believe Razer was (and probably still is) an overhyped/overpriced brand, sorry Razer.
LATER EDIT:
There is an OpenRazer driver for Linux, and and OpenGenie configuration GUI tool for Linux, which is great.
Unfortunately my model is not listed as supported (with USB ID 1532:0002), and I get no Razer device detected, though the mouse is working with the generic Linux drivers. The model I have is one of their first Diamondback models, from 10+ years ago, so this is just a note not a complain.