If you want/need multimedia support you need to download the version who has that support build-in.
If you want Mint 13+Cinnamon (64-bit) with multimedia support, click here:
http://www.linuxmint.com/edition.php?id=106.
If you want Mint 13+Cinnamon (32-bit) with multimedia support, click here:
http://www.linuxmint.com/edition.php?id=105
If you want Mint 14+Cinnamon (32-bit) with multimedia support, click here:
http://www.linuxmint.com/edition.php?id=117
If you want Mint 14+Cinnamon (64-bit) with multimedia support, click here:
http://www.linuxmint.com/edition.php?id=118
Mint 14 is the latest version of Mint.
under codec version it is written a version without multimedia support
This is easy to explain: Now there's only 1 page where you can find all the various downloads for 1 Mint version instead of having different download locations. It's easier to choose which version you need. With or without multimedia support, 32-bit or 64-bit.