Unpacking Britannia Campaign

I am sure that this question has been asked often but I am in something of a rush so if you coul all be so kind as to help.

I have run into trouble with the infamous unpacker. I have managed to unpack the vanilla folder fine but I really want to play with the Britannia campaign. However, when I paste the pathways

C:\SEGA\Medieval II Total War\mods\british_isles\packs\*.pack

into the source place and replace the destination with

C:\SEGA\Medieval II Total War\mods\british_isles\packs\backup

I manage to get the dos format packer screen to ask me up to the point of "overwrite files" and when I enter yes, I see the screen say the name of the pack files for an instant and then nothing happens. The unpacker just closes and nothing is unpacked.

Could someone please provide me with a clean text for the brittania camapign unpacking?

Quote:

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C:\SEGA\Medieval II Total War\mods\british_isles\packs\backup

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But this path wouldn't recognize as destination path, but only as the source path.

Try this command line (or something similar) in your unpack.bat:
unpacker.exe --source=..\..\mods\british_isles\packs\*.pack --destination=..\..\backup --verbosity=1 --base_pack_path=mods/british_isles/data/