Due to the closure of the site hosting this file, this method of downloading and installing KGCM is no longer available.
Also as someone has reported the individual file links to KGCM v4.3 as illegal, these files have been removed and are no longer available as well.
This is the second time that this has occurred and I am no longer willing to host any KGCM files on my accounts.
Please use the original link below and follow the installation instructions in that post.
If you are a Windows Vista or Windows 7 user I strongly suggest that you read this post and install fix #3 to disable UAC for the Medieval II Total War folder.
How To Fix UAC and VirtualStore Problems
I also recommend that you read the KGCM + HHB Frequently Asked Questions thread before deciding to install this mod.
KGCM Patch 4.2 + KGCM Patch 4.3 Download Thread
NEW: Finally, download the descr_character.rar file attached at the bottom of this post to correct an old error regarding movement of armies when led by a named character (thanks to [Celtíbero]Mencey for discovering this and vipman for testing it). After downloading this file extract it with your favorite utility, WinRAR, WinZip, etc, and overwrite the descr_character.txt file located in the C:\Program Files (x86)\SEGA\Medieval II Total War\mods\kingdoms_grand_campaign_mod\data folder (default location, yours may be different).