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In ECS 4.2, go to ‘File → Save As'. Select the project you wish to convert to ECS 5.2.x and click ‘Export’. This will export a .ccc file.
Save the exported .ccc file to a drive location and then close the ‘Save As’ window.
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Close ECS 4.2, and start ECS 5.2.x.
In ECS 5.2, create a new project ('File → New Project') and go to the ‘Layout’ screen. Right click and select ‘Add Matrix Frame’.
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Select ‘Import’, and browse to the .ccc file we exported from ECS 4.2.
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You will now have converted your ECS 4.2 configuration for use in ECS 5.2.x.
To share this project (and the .ccc configuration files contained within), use the ‘File → Export Project’ function to export the project as a .ccn file.