Hi to you.

When you install CAMduct, you are asked to select the database(s) you wish to install. There are Imperial and Metric databases installed by default. When you start CAMduct you get a choice of database to use:

Try using either of these databases to create a new job and import your dxf's.

Did you migrate your PM2000 database or are you just trying to use it from its old location? 

The database contains all of the information about materials, machine configuration etc. so it needs migrating.

There is a migration tool installed with CAMduct.