Datasmith is a part of the Unreal Studio Beta. If you don't already have access, sign up here.
Some file formats cannot be directly imported into the Unreal Engine using Datasmith, and instead the data must be converted into a file format that Datasmith understands. The plugins available for download on this page will allow your software to export the .udatasmith file format which can then be imported using Datasmith.
Please download the available installer file that matches the Unreal Engine version you are using, exit your content creation software, and run the .msi installer file to install the exporter plugin.
If you are installing these plugins on a computer that will not also have the Unreal Engine installed, then you may first need to install some prerequisite dependencies for either 64-bit or 32-bit systems.