First a coding style issue :) You should always curly-bracket your conditional expressions because otherwise the byte-code isn't saved and the expression is recompiled every time the code's run. (Well, it doesn't matter in this case but ... :)
Upgrading the acs-kernel datamodel by hand won't update the APM version number, will it? If that's in the script then I bet I can say that it won't be updating the APM version number for acs-bootstrap-installer ... can't you just check that? The user's going to have to visit the APM to get the version number updated, no, even though there are no upgrade datatmodel files?
Or am I all wet ...
