It may work, however we are unable to provide detailed support for the operating system, and you may encounter unexpected behavior.

There is nothing preventing it from working or locking out functionality, but unfortunately, Windows 7 is not officially supported due to the fact that Microsoft will shortly be ending support for the operating system. Thanks for writing in with your questions about Windows 7 compatibility with the Valve Index. Since im running my cv1 with SteamVR im pretty sure it work and the reason the tool said first okay its a good signed, but im asked the Valve support and they answered me this: well played Valve! Exactly i have a screenshot where its said supported :D

Then magically, the next day the tool gets an update saying Win7 is not supported and the store page lists only Win10 as a requirement. Originally posted by LOG3:What I really don't like is, that BOTH the Valve Index store page AND the 'Are you ready for Valve Index' tool stated that Windows 7 is SUPPORTED.

Index of windows 7