So if you're having troubles trying to extract the downloaded file from sendspace (such as getting all-errors), I suggest downloading the game from Percival first.
https://hotfile.com/dl/178141071/31ed05c/ygopro-1.02E.1-Percy-AE-full.7z.html
You can skip this step if you don't mind using a bugged Seal of Orichalcos (KC's version has the outdated Seal)

Then download KC's update from THIS site (so NOT sendspace!):
http://depositfiles.com/files/l3pi1x6k6

Then extract KC's update, but only replace the TDOANE launcher and system.conf. (ONLY if you downloaded Percy's game first. Otherwise just use this complete version)


If you're having troubles logging in after this, try opening the manual YGOPRO.exe first, then allow all internet connections. Shut down YGOPRO.exe and re-open TDOANE's launcher. That should fix most problems people are having with that error.


I hope this helps