I guess I am lucky that the text book still gets prescribe in some universities. I also think there is no other version of the text (I need to check that) I do not maintain it at all. And like I said, I solved most of the questions as part of the assignments and later worked out the left over ones, packaged it into a pdf.
When my professors found out that there was a solution manual floating about, they changed the textbook. Apparently all of the student's answers started looking the same.
