Hi Simone,
I faced the same problem and even mailed the technical support from Inspiration, Inc. After weeks I got this information:
After a bit more research here, I did discover we have very exclusive bundle deal with Handheld Learning and RedHalo. They provide a specially developed version of Inspiration for Pocket PC for their bundle. For more information, you are welcome to contact HandHeld Learning at www.handheldlearning.co.uk
This is a product exclusively developed for them and it not available elsewhere. Because it's so limited, I wasn't even aware of it, until I discussed it with our international sales folks.Then I contacted Graham and was assured that you can only purchase the bundle including the mobile learning platform. The annual pricing per student is moderate and tempting. So check with Handheld Learning and Redhalo.
If you only need a trial version/one licence then there's only a current version for PocketPC 2003 which is not operating under WM 5.