Dick,
It is a PITA the encrypted models. I have complained to numerous companies that using encrypted Hspice models, for example, limits their use to a small percentage of the designed in the world. Where possible I vote with my feet and use other companies devices.
Anyway, I don't know if it is of any help because it is a SMPS rather than a DC-DC, but there is a SMPS demo in the SIMetrix simulator called "flyback". If you cannot find it I can email it to you.
Keith.