It currently works on Android devices and can be used on Windows via emulators like MuMu Player or BlueStacks. It is not available for iOS.
The free version typically requires a "key" that you obtain by viewing advertisements. A "Keyless" premium version is often offered for a fee. Roblox Vega X Exploit
You may need to disable Windows Security temporarily to install it, which further increases the risk of infection. It currently works on Android devices and can
Vega X is designed as a script injector that modifies the Roblox client to execute user-provided code. Roblox Vega X Exploit