Did you complain to the university?   Which university?  Sounds like a low grade institution to me.  When I studied physics at Exeter in the mid 70s there was a lively trade in second hand books and I don&#x27;t think that any of the books specified that they had to be the absolutely latest edition.  Nor did the faculty write a book and demand that we bought it; I think that might have caused a lot of trouble then but students now seem to be more docile than we were.  We mostly didn&#x27;t do exercises from textbooks, we had tutors who set work so it didn&#x27;t matter which edition you used so long as the contents were correct.