Use 7zip and go to the file location. Right click on the file that has a 1 on the end, there will be an option to combine the files, then accept. After that you can extract the new 7zip regularly.I'm having trouble extracting HS2 once I've downloaded it. I've downloaded all of the files, and made sure each file ends with "... SPLIT.7z". I've then tried extracting it using 7 zip but it returns an error stating "Unexpected end of data". If anyone knows how to solve this issue, any help would be greatly appreciated.
Also, I prefer to download the part files rather than the torrent... as there are certain risks involved with downloading torrents that I would rather avoid.