You can try this one : it should have fixed all the bugs related to colonisation/purge, as far as i know.
https://www.dropbox.com/s/6xcj95s8oe8po8o/Purge-Colonisation Fix.rar
To install it, just replace the files in "Documents/Paradox Interactive/Crusader Kings II/mod/MiddleEarthProject Beta" with the ones in this fix.
Thanks for your support
And don't worry, we're still working on it, again and again
Success! Who Hoo I can colonize my vassal's land now. THANKS! I CAN'T wait for the other start points especially the 4th Age point!