Do I need 3ds max???

Okay, so I downloaded a model, imported the .max .obj and .3DS file in to Unity. After I do it says it has a error it says like “i need 3ds max downloaded and set as the defualt application” and it says under that something like “on line(like 221)” but do I need 3ds max? If so can I use like Blender???

Yes, you need 3dsMax installed if you want to use .max files directly in your project. Just use .fbx or .blend (with Blender) files.

Max files can’t be converted without 3ds Max, at least not right now.
I knew some people who tried to make an importer from max to obj,
but they didn’t managed to create it…