How to convert V-Ray / other renderer scenes to Corona?

Note: the converter will only work if you have both Corona and the other renderer installed on the machine where you are using it. It is fine to use the trial or even expired trial license of the other renderer. 
For example - if you are converting V-Ray materials to Corona, you need to have both Corona and V-Ray installed on your computer. 

For information about the newest Corona Converter 2.0 introduced in Corona Renderer 7, see:

How to use the Corona Converter (Corona 7 and newer)

What is the Converter Script?

This tool is bundled within Corona installer and converts most materials, maps, lights, and even proxies from V-Ray and other renderers with a single click. Usually the result is very close to the original non-Corona rendering, although sometimes additional manual tweaking of materials or lights may be necessary.

How to use it?

To run it, simply click the dedicated Corona Toolbar icon, or right-click in your 3ds Max viewport after installing Corona, and pick the "Corona Converter" item from the lower-right quad menu.

If you cannot find the converter in your 3ds Max quad menu, you will most probably need to locate the script file  and drag-and-drop it into your 3ds Max viewport. Corona Converter window should appear, with multiple conversion options and a short readme. 

In case of other issues, see: Corona Converter is not working!