Lurkers WDAD needs to be installed on a clean installation of SH4 for best results.
Here you will find WDAD
http://www.gamefront.com/files/users/dashboard
You unzip WDAD v.100 into jsgme, then unzip the patch V1.7 into jsme and install.
Japlance's Med campaign can then be installed over WDAD.
there are help files in both MODS