I am pretty sure the way you go back to v39 would be as follows.
Exit TWGS, remove TWGS from bootup
save your game/tw1 (or related folders)
to a backup spot (I use c:\twgsbk\tw1)
uninstall the TWGS
Delete the folders C:\program files\EIS\...
visually check that the folders are removed
reboot your system
Visually check that there are no EIS/TWGS folders
install v39 (but dont start it yet)
copy the saved game files to ...games\tw1
(or related game file name)
delete twmail.dat and twgame.log
Start the TWGS, stop server, enter config
add the new games and direct the files accordingly.
bang games
Reboot
Server should be working properly.
you MUST remove the twmail.dat file when going back to v39 because v40+ used a different programing (shrug..ask JP)
Hope this helps for anyone needing to return to v39 from any of the v40+
Hekate
hekate@twlinks.com
http://www.twlinks.com
telnet://twgs.twlinks.com