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Just extract the zip into your custom assets folder.

Edit: To clarify, the "Starships for Dungeondraft" zip already incorporates all of the images found in the "Starship Interior Tiles" zip, so there isn't any need to import the tile images into Dungeondraft. 

"Starship Interior Tiles.zip" is a large collection of image files (jpg and png) that can be used in any program that accepts them (such as Unity, Gadot, Photoshop, etc.).

"Starships for Dungeondraft by MrJayzee.zip" contains files that are specific to the Dungeondraft Software and cannot be used with anything else.

I noticed that many of the default objects in Dungeondraft could be tinted white to look like hand drawn objects, so I opted to focus on the location art instead of individual items. I may go back and add to them in the future.