Freda certainly is designed to work with Windows 10 Mobile (indeed, I use the app on my WM10 phone).
There are various things that could prevent it launching, particularly preventing it launching the first time. These include: phone memory being full, too many other apps running, failure to get licence from the Store, failure to start up the advertising service via the internet. Ideally, the WM10 operating system would handle these cases and report them properly, but in practice it is not very dependable. So, for best results, when starting Freda for the first time:
1) Power off your phone (to the 'goodbye' message) and switch on again.
2) Ensure you have a good WiFi connection
3) Launch the Store app. Search for 'Freda' and check that the store shows the app as 'this product is installed' on its Store page. (if not, wait a while and try again - or look into solutions for the Store app needing to be reset)
4) Now launch Freda using the 'launch' button on the Store page from step 3.
If this does not work for you, please email again, and I will see what else we can try.