AGS extension is derived form BaaN IVc4
I think all users below BaaN IV C4 has to upgrade to baaN IVC4 first and then to AGS. There is no document available giving the differees between AGS and the version below Baan IV C4.
BaaN tells that it can be loaded on the your present version, but don't know how. You can find documentation (not technical) on AGS0 in BaaN support site.