How to add a downloaded .box file to Vagrant?

Solution:

vagrant box add my-box file:///d:/path/to/file.box

Has to be in a URL format.

Try to change directory to where the .box is saved

Run vagrant box add my-box downloaded.box, this may work as it avoids absolute path (on Windows?).

Alternatively to add downloaded box, a json file with metadata can be created. This way some additional details can be applied. For example to import box and specifying its version create file:

{
  "name": "laravel/homestead",
  "versions": [
    {
      "version": "7.0.0",
      "providers": [
        {
          "name": "virtualbox",
          "url": "file:///path/to/box/virtualbox.box"
        }
      ]
    }
  ]
}

Then run vagrant box add command with parameter:

vagrant box add laravel/homestead /path/to/metadata.json

You can point to the folder where vagrant and copy the box file to same location. Then after you may run as follows

vagrant box add my-box name-of-the-box.box
vagrant init my-box
vagrant up

Just to check status

vagrant status