Contact

Last updated: August 25, 2026

Questions about the book, your order, or the diagrams? We read every message.

Psst — this is our first book, and we're hoping to publish many more.

Email us at:

info@lextrem.com

We usually reply within 2 business days.

Common questions

• My download link expired or didn't arrive: email us with the address you used to buy and we'll resend it.
• I can't open the EPUB / PDF: include your reader or software name and we'll help.
• I found a typo or a bug in a diagram: we love these reports — thanks!
• Press, reviewers or bulk / team purchases: reach out, we're happy to talk.

Order status

You can look up any order on the main page — scroll to the pricing section, enter your email in the "Paid already?" box and you'll get your download link right away.