Better un-pure client error message

code/server/sv_client.c

@@ -1374,7 +1374,10 @@ static void SV_VerifyPaks_f( client_t *cl ) {
 			cl->lastSnapshotTime = 0;
 			cl->state = CS_ACTIVE;
 			SV_SendClientSnapshot( cl );
-			SV_DropClient( cl, "Unpure client detected. Invalid .PK3 files referenced!" );
+			SV_DropClient( cl, "Unpure Client. "
+				"You may need to enable in-game downloads "
+				"to connect to this server (set "
+				"cl_allowDownload 1)" );
 		}
 	}
 }