I want to find a good German course. I know there’s Duolingo, Babbel, Rosetta Stone, etc., but I find they don’t work for me.

I want a course like the ones from 15-20 years ago that would give you some text books and some CDs for listening exercises.

I started learning German with one of those that my dad had, but unfortunately the audio lessons are incomplete.

I’d like to know where I can download/purchase a course in that format. I also prefer that format because my internet access is intermittent so I want to be able to study offline.

Thank you!