EPLAN and its authorized partners (like Hanser Publications or Wiley) do offer legal digital copies. You can often get a (first 3 chapters) from the publisher's website. Furthermore, if you purchase a hardcover book, many publishers include a voucher code to download the official EPLAN Electric P8 book PDF for your tablet.
: Recent editions often include a "P8 Magic" knowledge portal and downloadable EPLAN projects that mirror the examples in the text. ScienceDirect.com Book Specifications