After more than 15 years covering everything Apple, it’s with a heavy heart we announce that we will no longer be publishing new content on iMore and the iMore forums will be closing as of November 1st, 2024.
It is not installed by default. Therefore, go to the App Store app on your 4th generation TV and then select "Search". After that, enter "iMovie" to locate it. Afterwards, select it and then select "Get" to install it.