Change Download preferences in iTunes on PC
In the iTunes app on your PC, use the Downloads pane in iTunes preferences to choose to download items automatically and to choose the size and quality you want.
To change these preferences, choose Edit > Preferences, then click Downloads.
Automatic Downloads | When you make purchases from the iTunes Store on your iPod touch, iPhone or iPad or on another computer, the purchased items are automatically downloaded to this computer. To automatically download Apple Music songs you add on other devices, select Music (Apple Music subscribers only). | ||||||||||
Always check for available downloads | iTunes displays the number of items you previously purchased from the iTunes Store but didn’t download. | ||||||||||
Download full-size HD videos | Select to download the highest-quality high-definition files available for videos you purchase or rent from the iTunes Store. Higher-quality files use more storage space. | ||||||||||
Download high-quality SD videos | Select to download the highest-quality standard-definition files available for videos you purchase or rent from the iTunes Store. Higher-quality files use more storage space. | ||||||||||