Roblox Studio is not available on mobile devices
You cannot install the full Roblox Studio app on iPhone or Android
Use a PC or Mac to download Roblox Studio from the official Roblox website
If you only want to play Roblox on mobile, install the Roblox app from the App Store or Google Play
If you need to create or edit games, use a computer or a cloud PC service that supports Roblox Studio
Avoid third-party apps or APKs claiming to be Roblox Studio on mobile