I'd chuck it in meshlab or cloud compare sample it to generate a point cloud. Then remesh it.
Export the mesh to your slicing software.
The tool you are trying to use converts it to a solid acis model. I doubt it would work with something that complex

Point cloud to analytics finds planar, cylindrical, conical, ellipsoid surface sections in meshes. It's suitable for mechanical and csg-type models, it's completely irrelevant and inappropriate to your statue mesh. You don't need to convert it to a CAD solid at all to 3D print, and if you're using Cura as a slicer, it accepts six or seven import formats for your model and it's tolerant of notional flaws that will stop SLA or other UV-cured resin printers. If you want to modify your model, for example put it onto a base, PunchCAD V12 does much better mesh booleans than earlier versions, make the base as a mesh and it should add to your model as you'd expect solids to add. Failing that, Meshmixer, a freeware app that Autodesk took in-house for a while and added good features to, like mesh trimming, closing, shelling and booleans like this, will do it.