All,

 

What I want to achieve:

I'd like to do a major upgrade with old registry settings retained from
previous installer.

i.e. registry values previously installed by an older installer which
later got updated

 

I tried the following ways but still failed.

 

Example:

I have a previous install (Installer A) that populates the registry,
say:

hklm\Brian\Test : install=1

if I then change the registry manually afterwards

hklm\Brian\Test : install=2

 

Case 1) Major upgrade

If I do a major upgrade with another installer (Installer B), it removes
hklm\Brian\Test completely.

Installer B has a new packagecode and productcode but same upgradecode
compare to Installer A.

Installer B itself does not change hklm\Brian\Test

 

I then tried with a different upgrade code, this works but you end up
having multiple entries in Add/Remove Programs

 

Case 2) Minor upgrade

Do a minor upgrade with another installer (Installer C) using
REINSTALL=ALL REINSTALLMODE=vomus

Installer C itself does not change hklm\Brian\Test

 

Result

It reverts the registry back to what the previous installer (Installer
A) default is.

i.e. hklm\Brian\Test : install=1

 

Regards

Brian


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