Hello ,
Thank you for contacting us and reporting this. The plugin is available and should work well for 4.27 and for 5.0 you need to build the engine based on the github resources. We are also working on updating the plugin for the official release of 5.0 but if you are still having issues please use the Unreal Engine forum for further help. https://forums.unrealengine.com/c/development-discussion/datasmith/43
Kind regards,
Vincent B.