Hey Guys,
Was just having the same problem on W7 trying to download my nephews first to DPC logs on the Leonardo. After setting up the folder under My Documents (running as admin), I also made sure that trusted identities (admin, trusted installer & my personal) had full authority. Not sure if the last part helped or not, but since I'm the only one on my pc, not a big deal. I then copied over the "database" folder from the original "C:\Program Files (x86)\Cressi PC Interface\database" to the "My Documents" folder: C:\Users\Admin\Documents\Cressi\database\AnthonysDPC". (the AnthonysDPC name was created with the app. I only created the Cressi folder and copied the entire contents of the "database" folder.
This time, when I created the new name, it kept the data, the device name, and history.
Hope this helps.
ps. My nephew enjoyed using the Leonardo and the "One" button still allowed him to find dive information easily before I finished fidgeting with my Oceanic GEO2. Large readable and easy to identify numbers. We did not remember to test the light, as we were already using flashlights in the lake (very murky waters at 40').