Changing the default render version .

After installing the newest version of Maya , sometimes you would like to render with an older version.
However the render command will always default to the newest one.

You can change that temporarily by locating the older render command in the installed folder

For example

"C:\Program Files\Autodesk\Maya2008\bin\Render.exe" -r mr myFile.ma

For a more permanent solution

You can change the order of Maya version in the environment variable located under

My Computer > Advanced > Environment Variables >System Variables list - Look for Variable called Path