Subscribers to the PDF/EPUB version can download the updated files from Gumroad by either going to their Gumroad account or using the link in the receipt emailed to them when they bought the book. When downloading from Gumroad, you always get the latest files, including any small changes that we release between regular monthly updates. Our FAQ offers further advice about downloading updates.
If you bought a book from Amazon, you’ll need to go to Amazon support to ask them to make the update available to you. The difficulties of getting updates from Amazon is one of the reasons why we recommend people to buy the PDF/EPUB version, which is easily transferred to Kindle devices.
https://office365itpros.com/2022/10/01/office-365-for-it-pros-oct2022/