Some of the Extras and Supplementary (appendix) resources to Springer Nature's scientific, technical and medical publications including tables, graphics, images, software, solution manuals, worksheets, audio/video files and other materials were made available online for download.
Please first check our product page for the title in our Springer Nature Link webshop and read the ‘About this book’ section. The ‘About this book’ section will indicate if materials are actually available within the book itself, or contain links for how to access those materials. If extra/supplementary (appendix) materials are available within the book itself, they usually appear in the 'back matter' section.
Extra Materials Archive
Contents of CD-ROMs or DVDs have been made accessible on: Extra Materials Archive Search.
Please enter the ISBN of the title into the search field and click on Search. You can now download the files that are offered for the title.
Supplementary (Appendix) Material
You may see: Includes supplementary material: sn.pub/extras listed under the description section on product pages for some books. If you don’t see this text, click on ‘show all’. There’s a possibility it is beneath the ‘show all’ section within the description. ISBN 978-3-658-03493-1 is an example of a German language text where the text appears under ‘show all’:

After clicking on ‘show all’, Includes supplementary material: sn.pub/extras may appear:

If that text appears, it means the supplementary materials were made available on this link: Extra Materials Archive Search.
Springer Nature Link
Some titles offer the extra material on Springer Nature Link site. If you go to the corresponding book on Springer Nature Link and then click on a chapter, you will see the note "Supplementary material" on the right. Here you can click on it and view / download the files. i.e.:

Lecturer Material
Please note that instructor materials are not available for every textbook.
For some titles, a “Request lecturer material link (sn.pub/lecturer-material) may appear in the Overview section of the product page, as shown in the screenshot below. This link directs you to our Lecturer Material webform.
Please complete all required fields in the form and submit your request. Once received, our team will review the information provided and, if eligible, share the available lecturer/instructor materials with you.

Contact Information
If you are unable to locate the supplementary (appendix) resources, please contact our Customer Service team with the ISBN / title / author information so we can find out if the materials may be available elsewhere.
Note: We do not offer instructor materials for Apress books. However, here is the link for if you need to Access source code for Apress books.