hola y bienvenido a la notepad++ community, @Zoilo-Lagos-Lopez
on notepad++ 7.6.6, if your LUSquirrel.xml file begins with:
<?xml version="1.0" encoding="Windows-1252" ?>
<NotepadPlus>
<AutoComplete language="...">
then copy it to C:\Program Files (x86)\Notepad++\autoCompletion\.
(C:\Program Files (x86) is an example and will depend on your notepad++ installation path)
if your LUSquirrel.xml file begins with:
<NotepadPlus>
<UserLang name="..." ext="" udlVersion="2.1">
...
then copy it to %AppData%\Notepad++\userDefineLangs\.
note: if your notepad++ is not a default installation, or a portable version, we would need your debug info from the notepad++ menu ? > información de reparación... > copy debug info into clipboard to tell you the corresponding paths.
saludos.