Q: Apple ID disabled

As well as resetting the account's password, you've also logged out and back into the account everywhere that you're using it : What to do after you change your Apple ID email address or password - Apple Support ?

If that doesn't fix it then contact iTunes Support : https://www.apple.com/emea/support/itunes/contact.html

Try resetting the App Store:

Close the App Store completely from the app switcher window by double clicking the Home button and swiping up the App Store preview pane until it disappears from the screen. Then sign out of the iTunes Store (in Settings).

Then restart the device.

Then sign back into the iTunes Store and try downloading again.

Also check Settings > General > Restrictions > and make sure that the iTunes Store, Installing Apps, Deleting Apps, and In-App Purchases are all under the Allow section.