Upgrading from Version 4.x
By default, Crossword Construction Kit 5 is installed in the same folder as Crossword Construction Kit v4.x.
Crossword Construction Kit 5 will read puzzles created by Crossword Construction Kit v4.x - .cw3 files. There are two primary methods for loading the puzzles from a previous version.
1)Export your puzzles (File > Export Puzzles) from v4.x and save to a new file. In Crossword Construction Kit 5 click on File | Import Puzzles to load them into the your current puzzle file.
2)Click on File | Open Puzzle Collection File, navigate to the .cw3 puzzle file and load it in.
The puzzles are interchangeable between the two versions.