YouTube still works on the Xbox 360, both on retail and RGH/JTAG Consoles.
An Xbox Live account and an active internet connection are required. If you are using Xbox Live, a stealth server is highly recommended on an RGH/JTAG console.
Installation
If you had previously used YouTube on the Xbox 360 with your Xbox Live account, go to the Settings tab in the Microsoft Dashboard > Account > Purchase History and redownload the app from there.
If you haven't, download this as well as the Optional Media Update and use one of these methods:
RGH/JTAG
- Download the files and unzip the '423607D3' and 'FFFE07DF' folders.
- Copy the Folders to 'HDD/Content/0000000000000000'
- Enable the Title Update (if it is not already enabled).
- Launch the App from the Dashboard of your choice.
Retail
- Get a USB formatted to FAT32
- On the root of the USB, create a folder named 'Content', inside create the folder '0000000000000000' (16 zeroes).
- Copy the '423607D3' and 'FFFE07DF' folders to '0000000000000000'.
- Plug the USB into your Xbox.
- Go to Settings tab > System > Storage Settings.
- Choose your USB.
- Choose 'Games and Apps'.
- Click on YouTube and the Media Update (if possible) and copy them to your Storage.
- Return to your Dashboard, go to Apps and launch YouTube.