if fileExists("/usr/lib/enigma2/python/Components/Converter/" + x +".pyo"):
It is better to do it than through the fileExists, but with a method listdir from module os
os.listdir('/usr/lib/enigma2/python/Components/Converter/')
I have already implemented it.
Keep the following version of the plugin 1.3
In this version In the tmp folder will created two files named converter and renderer and plus two files named converterneed and rendererneed.
In this lists (converterneed and rendererneed) will be shown converters and renderers, which not exists in your image.