Dear Ignacio Tornero Raga,
We're sorry for this late. Because we are at night, we can't answer for you sooner. We've sent guide to install quickstart in the ticket. Please feel free to check in there.
The part that you saw in this link:
www.smartaddons.com/joomla/templates/template-user-guides is the area for memberships, so you can't access there. Our guiding of product just only supported for membership or our single purchase, so we don't public. We hope to see your understanding for this policy.
Once again, we are sorry if at this time you aren't received the best support. Please describe clearly about your problem in the ticket, our supporter will help you and giving the answering in there.
We really hope to see the sympathy from you for all things that you've posted.
Thanks!