There's a great freeware program for updating programs. It's called
ResCompare. I'm not sure where you can find it, probably try shareware.com.
Anyway I've found this program very useful in the past. It allows you to make
a patch (or update) for a program very easily.

Martin Fitzgibbons wrote:
> 
> I suppose following on from the discussion of installers.
> 
> What would the best way be to supply upgrades to people with
> my products from my Web site?
> 
> I am thinking on the lines of the FBII upgrade installer.
> 
> All I want to do is check that they have an existing copy of
> of the product on their machine, say with a creator type CWCR.
> If so unpack and install, if not an appropriate message.
> 
> Can this all be done from a commercial installer or would I have to
> write it myself or has someone already done this that I could buy a copy
> and customise?
> 
> Martin
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