Once downloaded, it is installed as a regular WordPress plugin, not a Simple:Press plugin. This is because it connects to systems other than just Simple:Press
Download the Importer Plugin file to your desktop from our store using the link provided above.
In the WordPress Admin dashboard select Plugins->Add new
You should now see a screen with the list of plugins that are installed on your system. At the top left is a button labeled Upload Plugin. Click on it.
You should see a dialog box asking for the plugin file. Navigate to your desktop and choose the file you downloaded in the first step of this procedure then click the Open button at the bottom of the dialog box
You should now be back in the main Add plugin screen with the filename filled out. Just click the Install Now button.
If all goes well you will see a new screen with a link that says Activate Plugin. Click on it. That will complete the plugin installation process.
If all goes well, you should see a new item added to your FORUM Menu called Importer For SP 6.x. It usually shows up at the bottom of the menu: