If you only want lighting control without macros or button mapping, OpenRGB is an open-source utility that works on Windows 7 and supports many Razer devices. No driver conflicts, light-weight. Cons: No macro support, no cloud sync.
It is understandable why many users cling to Windows 7. It was reliable, familiar, and avoided the telemetry-heavy nature of Windows 10. However, if you want to use modern gaming peripherals, the hardware gap is becoming insurmountable. razer synapse 3 windows 7
: Offers comprehensive tech support, including OS troubleshooting and peripheral setup. If you only want lighting control without macros