The obj files are broken when imported into any slicer and the mesh seems to be unrepairable by normal means. I could work around that, but I find "ready-to-print" to be misleading here because you will not actually be able to print the details in the model. The details on this print are defined entirely by faces with little-to-no depth difference from the surrounding mesh. The ZBrush Polypaint curves were converted directly into flat surface topology without creating physical relief or sub-assemblies. In ZBrush, painting surface lines via polygroups or polypaint looks crisp on screen, but unless the author makes the effort to extrude physical grooves (or exports and provides separate sub-mesh bodies), that detail turns into flat surface topology in standard .obj files (the only files provided here).