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.

Your purchase confirmation page provides browser-linked access for seven days from checkout creation. New purchases also receive a private email download link that works across your own devices for seven days after payment confirmation. Once saved, the PDF does not expire. Download promptly and keep a backup.

Yes. You can open the private link in your purchase receipt on another device during its seven-day access period. After downloading, you may transfer your saved PDF to your own devices for personal use. Keep the link private; it is not a public sharing link.

For new purchases, a payment receipt is emailed to the address you enter before checkout after a successful live payment. Its purchase description includes a TEKBOOK thank-you message and private download link. Check your spam folder if needed. The PDF is downloaded securely from TEKBOOK rather than attached to the email.

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.

For the confirmation page, use the checkout browser and keep its cookies. Or open the complete private download link from your receipt email. Check your Downloads folder and save a backup. If you still need help, email TEKBOOK Support with the book title and receipt or purchase reference. 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.