Questions & Answers

PDF is a common file format for digital books. It keeps the pages, text and pictures together. Most phones, tablets and computers can open it with a browser or PDF reader.

No. Buy Digital Download purchases a downloadable PDF. For an Amazon edition, choose Buy on Amazon and check the format shown on Amazon before ordering.

Only books showing a Buy Digital Download button are available directly from TEKBOOK. Other titles remain available through their Amazon links.

No. A digital book purchase is a one-time payment for the selected edition. The checkout page shows the amount before you pay.

The download access window lasts seven days from when you start checkout. Return using the same browser used to purchase. Once saved, the PDF does not expire. Save it promptly and keep a backup.

Yes. After downloading, you may transfer your saved copy to your own devices for personal use. The purchase download link itself requires the original browser. It is not a public sharing link.

TEKBOOK currently delivers the book on the purchase confirmation page, rather than as an email attachment. Save the PDF and keep your purchase reference. Do not rely on email for access to the book.

Some payment methods take longer to finish. The PDF becomes available after payment is confirmed. Leave the confirmation page open or use Check purchase again. Contact support if the problem continues.

Use the same browser and device you used for checkout, and avoid clearing cookies or using a different private browsing session before downloading. Check your Downloads folder. If you still need help, email TEKBOOK Support with the book title, purchase email and purchase reference if available. Never send card numbers, passwords or security codes.

You may print a copy for your own personal use. Please do not upload, distribute, resell or share the file with others. Your purchase is for your personal use.

Contact TEKBOOK Support for an incorrect, unusable or undelivered file, or a duplicate purchase. We will review the purchase and provide the correct usable file or a refund where appropriate. Change-of-mind refunds after successful delivery are not routinely offered. Your rights under applicable law remain protected. See the Terms of Service.

No. They are independent guides. Follow the safety notices and scope stated in each book. Consult manufacturer documentation for your exact model and seek a qualified technician when needed.