Via the content browser you could just import a cube to the engine content directory/basicshapes/ directory is what I meant. Actually I didnt realize there is a “verify” option on the engine in the launcher. Can you try running that? If that doesn’t work just download a previous version of the engine (i.e 4.12) copy the cube out of it and paste it into the Engine/Content/BasicShapes/ directory where you installed the version you are having trouble with.
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