fist two weren't ISOs, were they?

If you don't mind downloading again, you could get the unpacked BDMV folder from usenet or myspleen.
Their contents are the same as Harmy's ISO.

If you're concerned about bandwidth, or concerned about wasting your time and energy downloading again,
then you might want to check your ISO for corruption first:

unrar said:
UNRAR 3.93 freeware Copyright (c) 1993-2010 Alexander Roshal

Volume ROTJ AVCHD.part41.rar

Pathname/Comment
Size Packed Ratio Date Time Attr CRC Meth Ver
-------------------------------------------------------------------------------
ROTJ AVCHD.ISO
8460697600 72093560 <-- 14-08-11 17:09 .....A. EEA9D6FE m0g 2.0
-------------------------------------------------------------------------------
0 0 72093560 0% volume 41