Problem with rar file

Hi,
Can you help me please ?
Next friday, I have downloaded the alan darts adventcalender.rar and when Ive tried to decompress it, a message appeared : error of piece of data.
So I wonder, if the file is badly compressed, can I get back my 30 Gold coins or Can I try again to download it without pay for it once again, and what happens if it doesnt work again.
Thanks for your reply.

NATIEL

Hi,
Sorry, but it works. In fact, there are two files in this adventcalendar.rar, and I succeeded in decompressing it. So forget what I said before.
Excuse me about it.