Windows 10 still receives security updates until October 2025 (with extended support available). It is lightweight, free if you already have a Windows 7 license (upgrade path still works via media creation tool), and runs Synapse 3 perfectly. Most older hardware runs better on Windows 10 than on 7.
Running on Windows 7 is a complex endeavor because the operating system is no longer officially supported by Razer for this specific software version. While newer versions of Synapse are designed for Windows 10 and 11, users with legacy systems can often still achieve functionality by following specific compatibility steps or using alternative software versions. Compatibility and System Requirements razer synapse 3 windows 7