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I checked libgen, found 3 (out of 10) of the books
one was from 2008 (4 new eitions since then, latest 2022), one was up to date and one from 2012 (3 editions since then, latest 2020. This last one was the most shocking because it's written by some really high status professor of international law at big shot universities)
I live in a country with 10 million people (of which 2 million dont speak the language) attending a course that few people do and those who find themselves studying this are usually upperclassmen to begin with. The odds of finding a book in my niche language thats also up to date are miniscule.
That's also looking past the entire point of having the book to begin with: we are allowed to bring them in with us to our exams and read them as we write. Having them as a digital copy does naught for me nor are we allowed to print them out and bring them loose with us.
The books are "valid" for about 2-3 years before the author churns out a new copy to make some more cash (and because the law is constantly changing and thus you have to update things continuously) so the already low sample size that buy these books reduce the odds of someone uploading them