The link will remain dead because it's actually another similar issue like the one reported by Punctum. He reported that stopping Grammarly application fixed his issue. If you use this application, you should quit it when you import a 3D model in Sweet Home 3D.
If you don't, this must be another application and it would be nice if you could find which one (disabling Allow in background option for each application in System settings > General > Login items should help you).