That is the theory - I have not tried it yet on a dotlrn installation with real data and I am just answering this because no one else has yet so that you get at least a rough idea of what has to be done. It might be that after upgrading acs-kernel individually you need to do the same for acs-service-contracts.
Of course try it only on a copy of your database first!
Feedback about problems you run into would be highly appreciated.
> If the database has changed after the upgrade, can we still use it
> with the old installation?
> Is it maybe possible to access the same database with an old and a
> new installation at the same time?