But, do new editions have different content, they don't even bother to change problems forget about providing digital copies and compendiums. Just compare two books of same subject for 2 different decades there has been no major inclusion of chapters with recent technological development. However, they do introduce new subjects in their curriculum for the sake of modernization.
I am not talking about colleges providing old text books to students, I am talking about changes in the syllabus with research updates in revised editions. For e.g If a student has to do a practical on finding some environmental parameter, he refers APHA manual of 1996 but later finds that the method has become obsolute and new methods can only be found in research papers, in such cases who is to blamed for wrong results student or AICTE for not updating the content.