To install Call of the Wild 2,

just unzip the files from callwld2.zip into the battlezone\addon
directory.

run mapadder

type callwld2

the map should be installed.

If you want to remove the original call of the wild, open up 
the netmis.txt file in the battlezone folder and remove the line
callwild.bzn	callwild.des	8 8	callwild.vxt D Call of the Wild

then open the battlezone\addon folder and delete the folling files;

callwild.bmp
callwild.bzn
callwild.des
callwild.HGT
callwild.lgt
callwild.mad
callwild.MAT
callwild.trn
callwild.vxt

that is all there is to it.  If you have any troubles, contact me at
csthomas@atnet.net