Free download of both location databases and airspaces for Windows - world wide:

SHL no longer updates the data offered here. Do you like to be responsible for updating a specific region? Contact SHL if you are interested to do that job. Even if you are no PreFlight customer! You will get both the software required to edit the data and the information, how to convert that data into your own format. SHL can also offer initial data sets for regions currently not available for download here.

In the list you will find a disk image for each region.
Each image conains three files:

• The krd file defines airports, nav aids and compulsory reporting points (if defined)
• The spa file defines general data of airspaces like name, class or height.
• The seg file defines the horizontal size (via line and arc segments)

• call PreFlight and select the "Locations - Update" menu,
• open the downloaded folder and
• click the "Update" button.