They are not on Anna’s Archive or on MaM. They are available for digital purchase from SpringerPub or Amazon.
Is there a different tracker for textbooks and reference materials?
How likely is it that a request will be fulfilled. Would someone need to buy the book themself and upload it?
Is it essential that you get the 3rd edition? 1st and 2nd are on Library Genesis+ (from 2017 and 2021 respectively)
Otherwise, my university had some deal with Springer that allowed the purchase of a softcover book for 25€ (I think it increased to 50€ later), but also free access for the online edition (though not necessarily the whole book in a single PDF, but each chapter separately). Have you checked for similar deals at your university’s library?
Unfortunately yes, the version is important. I will check out the library, although we have usually needed to purchase online editions. They are cheaper than the physical textbook, but not by much