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If you purchased from Adobe direct, then just go to Adobe web site http://www.adobe.com and sign in. In the Search field at the top of the Adobe home page, type in My Orders. Then follow the link to My Orders and find your order and the download files associated with it.
If there are problems in that regard, go to the following web site and download and install the free tryouts for Photoshop Elements 11 and Premiere Elements 11 (whichever one you want) and insert your purchased serial number into those installation files to make it your working copy.
Photoshop Elements 11 Direct Download Links: Free Trials, Premiere | ProDesignTools
The key to success to read and care out to the word the "Note: Very Important Instructions" on the web page, starting with when to click the "here" otherwise you will get an Access Denied.
Please let us know if that worked for you.
Thank you.
ATR