Hi bro, you dont need to un/re install to update. If you have a running system just delete 0.dat in ROM and hit pol.
check key Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\PlayOnlineUS\InstallFolder in regedit, to see the install path. the one to use in path.txt is what is before SquareEnix.
eg my InstallPath in REGEDIT is D:\Games\FFXI Game\SquareEnix\FINAL FANTASY XI\ so in path.txt i would use D:\Games\FFXI Game
run the install with uninstall.cmd.
If you want to watch the video its at https://www.youtube.com/watch?v=PbvE5deRUnk
Shout me in Game on Enko or Natyboi/Nastgel or pm me in discord.
Install and more!