Collections will not download

fixed need to download each collection and download maps from each collection step by step from 1 to 4

This is the official solution (by activision forum):

support.activision.com/.../Cannot-Access-MW3-after-Collection-4-Download

If you've downloaded DLC Collection 4 and cannot access Modern Warfare 3, please follow these steps:

From the Xbox LIVE Dashboard, go to Settings and select System

Select Storage

Select Hard Drive

Select Games and Apps

Select Modern Warfare 3

Find and select "Collection 4: Final Assault Marketplace Content"

Select Delete

Launch Modern Warfare 3 and you should now be able to access the Collection 4 content

This will delete a key that is required to download DLC Collection 4, but will not delete the content. The key can be re-downloaded from the Xbox LIVE Marketplace if you need to re-download all of the DLC Collection 4 content at a later date.

AppData is a hidden folder so you will need to see hidden folders in file explorer.
Microsoft Jigsaw should not be running when you do this.



The downloaded collection files are in your User\UserName directory (if you do not know where it is, just open a regular command prompt), the rest of the path is AppData\Local\Packages\Microsoft.MicrosoftJigsaw_8wekyb3d8bbwe\LocalState\DownloadedPuzzles
which should have a folder for every one of your collections (WinterWonderlandPack for Winter Wonderland Collection).
Just delete the ones you do not want, you will not need to purchase these again (gold or $), the collection should now be seen under Downloadable Collections with a download link to download it again if you desire to and not in My Collections.

AppData is a hidden folder so you will need to see hidden folders in file explorer.
Microsoft Jigsaw should not be running when you do this.

The downloaded collection files are in your User\UserName directory (if you do not know where it is, just open a regular command
prompt), the rest of the path is AppData\Local\Packages\Microsoft.MicrosoftJigsaw_8wekyb3d8bbwe\LocalState\DownloadedPuzzles which should have a folder for every one of your collections (WinterWonderlandPack for Winter Wonderland Collection).
Just delete the ones you do not want, you will not need to purchase these again (gold or $), the collection should now be seen under Downloadable Collections with a download link to download it again if you desire to and not in My Collections.

support.activision.com/.../Cannot-Access-MW3-after-Collection-4-Download