How do I install Razer Synapse 3 for my Razer keyboard?
Connect your Razer device to the USB port of your computer, then install Razer Synapse 3 when prompted or download the installer from razer.com/synapse3. After installation, register for a Razer ID or log in with an existing account. Note that the automatic prompt is only applicable for Windows 8 or later. (Page 3)
From the official Razer How TO Configure And Change The Led Lighting Color ON A Razer Keyboard manual, page 3
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