i downloaded the ragnarok 0616 by aDrive mirror and when i installed the file, corrupted!
Then download 0305 and patch it. Problem solved. ;]
check your downloaded file size, make sure it's around 1.2gb or so. When downloading such huge size file it's possible your internet or the host got check off in the middle and you ended up with an incomplete file. Try download again, possibly from different sources.