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Zet
Are you aware that the changes are not instant? If you make a change it wont show the new changes until you have reloaded your character so if you go into the outfit viewer that can show the latest changes you have made but you will have to close it and reopen it each time you change anything. Another option is to go into the character creation and then back out to see the changes on your character.
Make sure that the config.xml file is in the same location as the .exe of the program.
Make sure your game is loaded to the point that is shows a character that way you know it has generated the values it needs to modify for sure.
When you modified the base address make sure you didn't change any of the formatting of the xml file it needs to be a certain way to work.
I don't think that the location you run it from even matter at all because it's just using the process info not the .exe of the game.
hopefully something here can help you, I don't think there should be any issues with it being in french but I could be wrong on that.