Download itunes to iphone 8 plus

iTunes is a computer application available for Mac and Windows. It is not available for iOS. The iTunes Store is an app that comes preinstalled on your iPhone. From that app, you can download the content available in the iTunes Store directly to the phone.

If you can provide a little more information about what you're trying to do, it would be helpful in formulating answers.

Best of luck.

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Download apps and games using the App Store - Apple Support

I'd suggest trying a different WiFi network. Or, if the apps are small, try cellular data. Some WiFi networks don't seem to play well with the App Store.