Revit is popular in the Arch design industry but is very niche in terms of CG overall. When selling models on CGTrader or other generalized model websites, it's important that sellers offer models in software which not only has a large user base but also support for a wide variety of file formats. I don't use Revit, but it would appear that it doesn't support many 3d file format types outside of its own native formats and a few other CAD file formats. Fortunately, generalized 3d software like Blender or 3dsmax does support exporting models in DXF, DWG, DWF and other CAD compatible file formats that Revit can import and use. I could be wrong, but I think 3dsmax also has direct Revit scene file support transfer, so you could request any seller of .max files to convert the file into a Revit compatible format.