Razer stopped dealing with drivers in the normal sense a while back. You need to install synapse 2.0. Synapse will connect to the cloud and then download the drivers and update the firmware for all Razer devices. All your devices will be managed from synapse with one exception, virtual 3d surround (if you’re using it) is managed from it’s own program. Once everything is configured you can disconnect Synapse from the cloud if you want.
A word of advice, when they say don’t unplug stuff don’t. Don’t touch a fucking thing while Synapse is configuring it. I’ve broken more than a few deathadders with Synapse.
A lot of people hate Synapse and the entire cloud based driver model, but it’s actually not that bad once it’s up and running. If you’re keyboard and mouse are also Razer it’s one program to manage everything and update them as needed. If you have a Razer mousepad and headphones as well you can tell the software which ones they are and it will tweak the mouse sensor and 3d surround for them as well. It’s just obnoxious that you have to shut it down to disconnect it (doesn’t hurt anything once you’re configured) and more than a few people have bricked a mouse updating it.