Hi,
I am writing first time on this list. I am writing a installer for
a existing product, for which earlier installer was written in
NSIS(nullsoft script able installer system). I have to write a msi based
installer for this product using WIX. I have certain question regarding
this :-
1. How to detect whether my application is installed or not on a target
machine. application may have been installed using NSIS(older versions)
or MSI(now onwards).
2. How to write a WIX installer which can upgrade if there is older/same
version of product installed on target machine. I found this topic on
several sites but all those is not working. Specifically I want to know
which information (GUID, version etc.) needs to be changed in installer
code base on each release of the software.
3. Three/four version of our product releases each year. what kind of
installer will be best suitable for me ?
Please note that if I just change version of the product element in Wix
code, then newer installer is not able to replace older one. when I
double click the newer version of installer is shows a error dialog
saying:-"another version of this product is already installed .
Installation of this version cannot continue.To configure or remove the
existing version of this product, use add/remove Programs on control panel".
sample code
<?xml version='1.0' encoding='windows-1252'?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi";
xmlns:util="http://schemas.microsoft.com/wix/UtilExtension"; >
<Product Name='Baton' Id='41B8F929-B6CF-41BE-9E40-C96D9BD6D672'
UpgradeCode='E1F03FA4-D470-4FA6-86BA-F5CDD3007C1D'
Language='1033' Codepage='1252' Version='1.0.0'
Manufacturer='Company Name.'>
<Package Id='*' Keywords='Installer' Description="product Installer"
Comments='product comments'
InstallerVersion='100' Languages='1033' Compressed='yes'
SummaryCodepage='1252' />
<Upgrade Id='E1F03FA4-D470-4FA6-86BA-F5CDD3007C1D'>
<UpgradeVersion OnlyDetect='no' Property='PREVIOUSFOUND'
Minimum='1.0.0' IncludeMinimum='yes' Maximum='1.1.0' IncludeMaximum='yes' />
</Upgrade>
<!-- ***Install execution sequence*** -->
<InstallExecuteSequence>
<RemoveExistingProducts After="InstallInitialize"/>
.........................................
Regards,
Sanjay Rao
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