If the windows search is not searching the lua files, you can use e.g. the free tool Notepad++.
I already shared that info a few times now with you Marazota, afai can remember. Maybe write it down now
Notepad++ -> Menu "search" -> Search in files
Select your addons folder an enter the text you want to search.
In 90% of the cases you'll find the text or parts of it really quick and are able to contact the author of that addon then.