it's been tested on windows 10. i can imagine 7 would work, but we don't have any windows 7 machines around XD
VR Overlay System
@vroverlaysystem.bsky.social
https://store.steampowered.com/app/3873610/vrOS/
vrOS — Steamで配信開始！ SteamVR向けの効率的で高速なオーバーレイ。 便利なQoL機能もたくさん搭載！ 現在はWindowsのみ対応。 SteamOS / Steam Frameにも近日対応予定 soon™ いいね、フォロー、リポストで アクティベーションキーが当たるチャンス！ （72時間後に10名様を抽選！）
vrOS — Now Available on Steam! Efficient and fast overlays for SteamVR with lots of QoL features! Currently supports Windows only — coming to SteamOS / Steam Frame soon™ Like, follow and re-post for a chance to win an activation key! (drawing 10 winners in 72 hours!)