I'm using ISS.
A combo upgrade isn't the way to go in this case. Not because of the software, but due to the difficulty of upgrading the database so as to incorperate all the changes made while preserving the user's personal data. Plus, a combo would be a big waste of bandwidth. Why make people download a 15MB file to upgrade when all they need is a 1MB?
Basically, everytime a release is made the main installer will updated, and a much smaller upgrade pack will be released that would upgrade from 2.0+ up to whatever the current version is.
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