Migrate SSC 4.21 data to SSC 16.2

We have SSC 4.21 and will be moving to SSC 16.2.  Fortify Support said the best path to take is to install a new instance of SSC 16.2 and migrate the data from 4.21 to the new 16.2 database.  Has anyone done this or similar?  Any pitfalls or pointers on things to watch out for or tips are welcome.