I saved a couple of files as .indd files, but unfortunately, CS4 cannot open these of course. And now, I cannot use CS6 anymore because my trial period has run out. That is why I was wondering wether it is possible to open a CS6 file in CS4 without having to use CS6. If it is possible to convert these files without having to use CS6 I would be very happy.
You can convert them in any CC version as well, and could use a trial to do that.