I assumed you already had part one of the download, since you mentioned only part two failed. She means you will need both part one and part two of the Full Folder in order to install properly.
You need both file (part1 and part2) in the same folder, in order to be able to extract at all. You only have 1 extraction to make, it will combine the files automatically and make the hero_full_installer.exe
hmm..if kRO isn't needed...that means i can free up space on my lappy XD not that that's really an issue with 60gb of space and nothing better to do on it than play RO XD