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[Twor]

Is it possible to install version with the same (or smaller) product version over existing one ?
For example I'd like to install FULL version 1.0 of my product overwriting version 2.0 (which is DEMO version and has differnet product code but the same upgrade code).

The perfect soluction for me would be :
DELETE ALL existing files , copy new files
and I want to do this under other conditions than checking product version and file version (a flag, property or sth like this). I'd also like to keep all rules when I upgrade versions with the same product code
(Full -> Full, Demo -> Demo).

Can anybody help me or at least can anybody tell me that it's impossible ?

best regards
Piotr

[Ian Blake]

Hint.  Use Major upgrade.
Carefully read documentation on RemoveExistingProducts and the UpgradeTable.

I would give demo products a unqiue upgrade code.  And the main product a different unique upgrade code.
Product codes change for every version and Package code change for every build.  

Good luck