Hi Momunoz,
Thanks for visiting Apple Support Communities.
You may find the steps in this article helpful with downloading your purchase:
Troubleshooting Automatic Downloads for purchased Apps, Music, and Books
http://support.apple.com/kb/ts3688
If you're not able to download your purchase, you may want to report the issue using these steps:
How to report an issue with your iTunes Store, App Store, Mac App Store, or iBooks Store purchase
http://support.apple.com/kb/HT1933
Best Regards,
Jeremy