Do You jave this setting csdm_steam 0 in Your amxx.cfg file?
I guess there is something different in weapons between CS1.5 (1.6) and CS1.3 - this can be a problem. I don't have the source of CSDM for CS1.3 - so I can't help You (I don't know what really is different between these CS versions). That's probably why Your CS crashes.
