Update Rolled back after game crashes

[GlasgowZero]

This is around the third time it happened already, though it only happens occasionally when the game crashes then got launched again instead of having package check complete it returns back to downloading again and after I get to that stage the background download resets back to 27%. Has anyone ever encountered this problem before?

[Falbelmz]

It does happen once in a while, and it may be due to certain files being overwritten again and again. Your system could be crashed as the server reads those files are "corrupted" and the connection ends. Then, when you start up, it tries to replace those files. I have no idea what to suggest though...May I check how fast the re-download from 27% to full takes?

[GlasgowZero]

Well, my network is rather slow so it takes about around 8-10 hours to redownload it from 27% to 100%. I'm currently looking for a way to back up the files incase something like this happens again, any suggestions?

[Fuusuke]

Basically the launcher systems used are all the same in both JP and US versions, except for the destination where the patch files are to be read.
For some reason the launcher might have read the cache from the JP version, leading the launcher to download patches from the JP server.
When this happens, as the launcher automatically deletes files which are incorrect or corrupted, it will start deleting all the files from the JP because they are different from the US version.
Until an official fix is announced, what you can do is to try deleting all caches from your IE or browsers.

Is what Ringo Tarte said about the launchers getting rolled back.
Dunno' when this official fix will come but you can archive it if you have WinRAR or just copy and paste it to another area and then return the files to the main folder if it does get wiped out again.