TV's Frink said:
Some people report problems using jdownloader to unrar rars. Try 7-zip.
Just tried it. It keeps giving me a write error. I've still got plenty of space on my HDD and i'm inputting the password though, so i'm not sure what's causing it. @Handman, the file is the correct size now, I believe. My thanks to you and Harmy for pointing that out.