Hi Sam,
Apologies, I misread your initial comment.
Try downloading the file and saving it to your PC, then unzipping it instead of just opening the rar file straight from the download (if that's what you're doing).
Otherwise I'm not sure why the file is corrupt. It's downloading just fine on our end.
If all else fails, email us at
scythedevteam@gmail.com
And we'll get you a fresh copy.
Thank you for your patience and support.
Scythe Dev Team