Aquiring TATW MOS

First, you will need Medieval Two: Total War and the Kingdoms expansion pack.
Once you have purchased and installed both of those (they're available from Steam I believe, but if you get the disk it is better), go to the "normal third age mod" website in the video description.
Scroll past all the pictures until you reach the download spoiler tab.
Once you reach that tab, click the one that doesn't say "3.1/3.2 changelog"
Download all the parts into a folder on your desktop. then, install them in order - part 1, part 2, patch 3.1, patch 3.2. (you may want to install part one as part 2 downloads because they take like 45 mins to download.) ***If you got Medieval 2 from steam, make sure to click the "installation" spoiler and follow the steam-only instructions on the TATW download site***
to install them, just double click on them.
now you've got the base TATW mod, which is loads of fun and is better balanced than the MOS.
If you want all the awesome new content that comes with the MOS, however, you'll then have to go to the MOS download site in the description. download version 1.5 and the 1.6 upgrade. follow the instructions the site links you to.

here is the link to download the normal Third Age mod:
http://www.twcenter.net/forums/showthread.php?500418-Third-Age-Total-War-3-2-Released

MOS download site:
http://www.twcenter.net/forums/showthread.php?571022-MOS-the-ultimate-TATW-experience-released-1-6-for-Third-Age-3-2-Nice-gaming-summervacation!

-Sapoman and PrinceofDolAlmroth