Treeit Servers 1.7.5, 2.1.3, and 188.8.131.52 are available in this mediafire folder, along with the Treeit Client version 184.108.40.206:
Fairly Up to Date:
Isabella II FTB Edition
Treeit 220.127.116.11 Server (Cauldron)
Treeit 18.104.22.168 Server (Vanilla)
Treeit 2.1.3 Server (MCPC+)
Treeit 2.1.3 Server (Vanilla)
Treeit 1.7.5 Server (MCPC+)
Treeit 1.7.5 Server (Vanilla)
This modpack started off as a simple updating of Tekkit Classic to 1.4.7, the current version at the time. It quickly ballooned from there, with friends and others requesting additions, until it became something special, a combination of FTB, UE, and Tekkit, with some other things thrown in that gave it its individuality.
The textures need to be updated!
No time to play Treeit myself.
It's much easier to just regenerate the configs than try and get the old item IDs to work.