You should receive an email shortly with a download link for your files.
Note that all ebooks are delivered as zip files. This means that you should download them to your desktop computer or laptop first, unzip them, then use the files you want. (Most people just use the PDF, but when possible, we include ePub and Mobi files for people using Kindles, Nooks, and so on.)
For help, check out this quick video:
If you have problems, please shoot an email to firstname.lastname@example.org