Download the csv, the data file, and then MCC has you send it to them for a free conversion to their format (easier than manually doing it and only takes 2-3 days) and then you'll get the file back, upload/import wizard it to MCC, fix some of your small errors that MyFlightbook never caught.

I worked on the free version of MCC before I paid the enterprise version to know it would work out. They have great "how to" videos online if you run into any issues that help out pretty effectively. You can PM me if you run into other issues. I did all this last week.