Q: I preordered new Haim album and it shows purchased but its not actually downloaded release date was yesterday???

Hello miachurch25,

The following article provides information on the various methods for downloading preorders.

Downloading a pre-ordered item

When a pre-order item becomes available, you will receive an email letting you know your pre-order is available for download.

If you've enabled iTunes to automatically download prepurchased content, then your pre-order content may already be downloaded to your library. If not, simply click the download link provided within your email notification, and your pre-order content will begin to download. Alternatively you can use the "Check for Available Downloads" feature in iTunes on your computer by choosing Store > Check for Available Downloads to begin downloading your pre-order.

iTunes Store: About Pre-orders

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

Cheers,

Allen