To use it, you first need to write your fixing script, then save your script as python file, and then just set in your addon the path for the script and the path with the folder with all of yours blend file for fixing, press the run button and blender will make the rest of the job

*In your fixing script, don't forget to add at the end a line for saving your blend file

*You need to know a little bit of scripting to make your fixing scripts

*Its always good to backup your files before running your fixing scripts