If you use Windows Essentials 2012 or any of its components (such as Windows Movie Maker), download it NOW even if you already have it installed! Beginning tomorrow (January 10th) you will no longer be able to download it in case you ever need to reinstall it. And don't trust third-party sites to provide it -- older versions of Windows Essentials are notoriously difficult to find, and the 2012 version will probably be no different.
https://support.microsoft.com/en-us/help/17779/download-windows-essentials
Microsoft says "Windows Essentials 2012 suite will be available for download until it reaches its end of support date on January 10, 2017."
Here is the full download of the offline installer: http://g.live.com/1rewlive5-all/en/wlsetup-all.exe
Microsoft has said they will be introducing a new version of Windows Movie Maker soon, but it will probably no longer be free, and will almost definitely only be for Windows 10 users.