I have downloaded and combined all parts and have no trouble mounting them. Installing goes smoothly too, with both disc 1 and disc 2, until the last minute--Once the bar is full, it suddenly spits out the helpfully vague error, "The install failed. Files that were copied in the process will be deleted." (インストールに失敗しました。途中までコピーしたファイルを削除します。) Followed by the notification that "Deletion is complete." (削除終了しました。) I can provide screenshots but they won't reveal anything more, I don't think.
It's not much information to go on, I know. Any ideas what could be causing this mysterious error, and how to fix it?
Running Win7 x64.
ETA: After poking around with the files a bit I realized one of the iso files was corrupted...Redownloaded and suddenly it works! Still, would have been nice if the error message had been more informative...