You have to download BOTH parts of rar file. Then you can use 7zip or WinRarI keep getting an error on un-zipping
Right click at first part (JAG27zippart1.rar) in Windows Explorer. If WinRar installed then select Extract to JAG27zippart1. If 7zip installed then select 7Zip - > Extract to JAG27zippart1.
After you will extract this archive you will get a file JAG27.zip which you will un-archive the same way