Choose Preferences from the i Tunes menu, click the General tab, and select the Check for New Software Updates Automatically check box at the bottom of the General preferences to turn it on.The Mac App Store can update your version of i Tunes.
To update your i Pod touch software from i Cloud, choose Settings→General→Software Update.
If a new version of the software is available, you see the Download and Install button — tap it to install the new version of the software.
You can also click the Check Now button to check for a new version immediately.
If one exists, it appears in a window for you to select.
Though the build number isn't different between Apple's GM betas and the final version of i OS 11, some users are having trouble installing the final version of watch OS 4 with a beta version of i OS 11.
Here's how to rectify that: How to update from an i OS beta to the official release Updated January 23, 2018: Apple has just pushed i OS 11.2.5 with support for Home Pod and Siri news briefs, among other updates.By Tony Bove You should always keep your i Pod updated with new versions of the software that controls the device — which is i OS for the i Pod touch, or the i Pod system software for an i Pod classic, i Pod nano, and i Pod shuffle.New versions often include bug fixes as well as new features.Connect the i Pod to your computer, click the i Pod button, and you’ll see the Summary sync page appear.i Tunes automatically checks for updates of i OS or the i Pod software and lets you update your i Pod without affecting the music or data stored on it.All you need to do is select which updates to download and then click the Install button to download them.