Q: How do I download preorders

Hi, Tamara26. 

I experienced an issue a couple weeks ago for a Pre-order album as well.  If your Pre-order has been released, follow the steps in the article below to check for available downloads.  If it has been released but will not download, I would recommend canceling the Pre-order and download it again as it most likely has not been charged.  This article will walk you though the process.

iTunes Store: About Pre-orders

http://support.apple.com/kb/HT5714

Check your purchase history and you method of payment to make sure that the item has not been deducted prior to processing these steps.

iTunes Store & Mac App Store: Seeing your purchase history and order numbers

http://support.apple.com/kb/HT2727

If the album has been charged, follow the steps in this article to report a problem with this purchase.

How to report an issue with your iTunes Store, App Store, Mac App Store, or iBooks Store purchase

http://support.apple.com/kb/ht1933

Cheers,

Jason H.