Step 1: Download necessary files

You will need to download two tools -- the Blender2Ogre plug-in script (to create .xml files that are compatible with the Ogre representation of meshes) and the OgreCommandLineTools (to convert the xml files into the binary file format that ogre likes

• On the page in BitBucket for Blender2Ogre, click on the Branches tab, and then select the .zip file under the download heading for the default branch. Save the .zip file anywhere you like, and then unzip it to anywhere you like (but remember the location, you will need it later!
• Copy the Command Line Tools from your Ogre3D directory to C:/OgreCommandLineTools (you could, instead, leave them where they are as long as they are findable in your path, but that specific location is special-cased by the exporter, so if you place it there, it doesn't matter what your path is).

Step 2: Installing and activating script

Open up blender. From the file menu, select user preferences:

Select the Addons tab, and click Install from File

Navigate to the folder where you unzipped the blender2Ogre script, and select io_export_ogreDotScene.py

Press the "Install from File ..." button, and you then have a huge list of addons you can install. Either search through all of these to find the Ogre one, or type Ogre in the search field, and the click the square to activate this addon

You're done! Go back to the Quick and dirty blender tutorial and export away