Do you just want to convert the tables, or to 'clone' the entire appliation to Access? If you have access to the designer level of the application it is very easy to just export all records to CSV or Tabbed output, one table at a time. There is a utilty called datagrab if I recall that can automate this. When I used DataEase I was one of the top expert developers, but I have not touched it in years; switched to Alpha Five.
If you want to clone the app, then the migration tool is what you need, or hire a company that specalizes in this. But I have seen the results of such 'migration' and you get a 20-year old application sitting in a nice new Access envelope, with ugly forms that all need to be redesigned. I would never migrate, I'd rewrite.