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How to open or import design files of DC2456A (Demo board of LTC3779)

Dear expert,

I want to study the design files of the DC2456A from https://www.analog.com/media/en/evaluation-documentation/evaluation-design-files/DC2456A.zip

But I don't know how to import or open the design file (schematic and PCB files).

Could you please tell me how to perfectly open or import the file in Altium Designer so that I can modified the schemactic/PCB design file and build my own PCB? In ohter words, if I want to just fabricate a similar PCB or just change a little bit from your official design files, what should I do?

Thank you!