You're not doing anything wrong.
Inspiration in a flash isn't fully compatible. Go to google and type:
site:yamahasynth.com "inspiration in a flash"
You may want to limit to your keyboard or a related keyboard:
site:yamahasynth.com "inspiration in a flash" modx
site:yamahasynth.com "inspiration in a flash" montage
The compatibility problem shows up with different promotional libraries of the past. Most paid libraries will not have used the incompatible encoding schemes.
It is unlikely this will change. Initial indications for Montage were that perhaps the firmware would be updated to make the keyboard compatible. This is likely to never materialize. Later, there was some official communication that the content was being re-done to make it compatible. It's been longer than anyone would have expected to get this passed through the quality assurance stages. Perhaps something will be released sometime in the next 2 years. We'll see.