Hi Peter, yeah, I think you're right about how it works. It seems like most often the French-base course comes out first (sometimes it's a different initial base language, as with the old
Catalán sin esfuerzo, but it's usually French), and then translations into other languages follow, sometimes years later. So it often happens that the most recent course for certain base languages is a generation older than the current French-base course. And it seems like in that situation, Assimil usually continues to offer the audio for both editions.
The older audio is sometimes a little tucked away on the web site and hard to find. If you can get the ISBN for the audio and put that in the search bar, then it should come right up. And you can usually find that ISBN on the page for any corresponding book that's also offered on the web site (on the page for the book by itself, not for a whole pack that already includes audio). For example, I got the ISBN for the
Using Spanish audio on
this page for the German-base book (since the
Using Spanish book doesn't seem to be available).
It's a bit roundabout. You can also get to the
Using Spanish audio by going to the "Learn a language" menu at the top of the main page and choosing Spanish, though you then have to find it in lots of pages of results.
On the other hand, it looks like if you do a search and specify any base language, even a base language like English or German where this particular audio is still the most recent, the audio by itself won't come up in the results.
Anyway, I'm glad the audio for these previous-generation courses is mostly still available, even if it takes a little poking around to find it.