No you don't. I think you can do it, but it is not neccessary.
1. Save the "pack.0?" files. (I put them into a new folder named "ORIGINAL")
2. Put the unpacked folders ("anim", "binary", "map" and so on into the "data" folder of your game)
3. Open "shadow.txt" in the "data" folder.
4. Edit the line "PackIO 1" into "PackIO 0"
5. use CRC Bypass and have fun.
I hope i explained correct. That worked for me at least. lol