First you have to install Python and Pycrypto. See
http://dearauthor.com/wordpress/2010...-and-pycrypto/ how to do that. Then you have to hunt for the scripts. The moderators don't allow us to give links to these on this forum. Therefore you have to find them yourself. Googling for ainept epub pdf may help. Then download these scripts and make sure you save them under the proper name. They should end in .pyw, and if your computer stubbornly appends .txt to that name be sure to change the name until the extension is .pyw (make sure that Explorer doesn't hide the .txt). If that is correct the icon for the files should be yellow/blue snake-like. Double click on ineptkey.pyw and if all is correct it should tell you that it got your key.
After that, come back here.