Looks like some of your errors can't be repaired by the Automatic repair tool. It's fixed some errors, but you have some more it can not, and these might need the paid version to fix. I took the object into 3dsmax, and the STL checker there is showing 525 errors, which are mostly unwelded vertices and double faces, resulting in a non-manifold object. Is this an object you created in Sketchup?

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