In Detail view, check the box along the left edge to select files.
With a file or files selected, a Download option appears in the menu at the top of the page.
For those, you can drag tracks and albums from the Your Library tab to the box labeled “Download to your computer” in the lower-right corner of the app.
Cloud-based music services lets you listen to music from a multitude of devices — from a tablet in your kitchen to your phone on the subway — instead of only when seated in front of your computer where your local music library may reside.
The problem arises when you have your music collection spread across multiple cloud services and lose track of which songs you have on which service.
There's also a variety of database and configuration files that i Tunes uses to manage your entire library.
Manually moving your i Tunes files without breaking something can be a challenging game of trial and error.