Previous thread http://www.gamesas.com/topic/1068986-wrye-mash-thread-5/, http://www.gamesas.com/topic/1449775-wrye-mash-thread-6/
Download: https://github.com/Yacoby/Wrye-Mash/downloads, http://mw.modhistory.com/download--5568, http://morrowind.nexusmods.com/mods/27588
Readme: http://web.archive.org/web/20120123071813/http://wryemusings.com/Wrye%20Mash.html
Wrye's Site: https://web.archive.org/web/20150909225703/http://wryemusings.com/
Python Installer: http://download.fliggerty.com/download-92-79, http://www.theassimilationlab.com/forums/files/file/1260-wrye-python-08/
http://www.gamesas.com/topic/1051299-wrye-mash-launcher/ (only for Wrye Mash 84)
A lot of things was not updated and I've updated the OP plus change a little, because Python 2.5 is now both outdated, obsolete and shouldn't be used at all.
If you have trouble with Python (required for Wrye Mash 84) then use either http://www.gamesas.com/index.php?/topic/1106095-wrye-mash-stand-alone/ or http://www.gamesas.com/topic/1331996-yacobys-wrye-mash-fork/.
Below are the differences between available versions of Wrye Mash listed.