If Roblox is not downloading or installing on your Windows 11/10 PC, restart your PC and if that doesn't help, use the fixes discussed here.

Meta Quest 2 and Quest Pro users can now download the Roblox Open Beta, allowing them to create and engage in new Roblox experiences.

You’ll be able to try the Roblox open beta on Quest 2 and Quest Pro devices, and when the forthcoming Quest 3 is available, Meta says Roblox will work on that headset, too.