Compatibility Atlas 5 and 6

[Kathrin]

Hello!

I've been using my new Atlas.ti 6 version for a few weeks now, and everything runs like a charm. Today I sent a whole Atlas package (HU and texts) to a student of mine (hpr6), she is still working with version 5 (I think 5.5. - she already has the new nice blue Atlas start window there). She can't open it, the system does not recognize the hpr6. I told her to rename the HU exe file to hpr5, it opens (tells the usual: are you sure you want to open this, new version of Atlas, etc.), but then there's an error and the HU stays empty.

ANY easy way to open a hpr6 in Atlas 5? I dont have the exact error message of her, but ... I guess ... its compatible, isnt it?

Am I doing something obvious dumbly wrong here?
Thanks for help,
Kathrin