Hi all, I have InstallShield InstallScript MSI project. I added a custom action type 'Display error message and abort'.
Basically if the product is installed already then I want to display a message and abort the installation.
So for 'Install Exec Condition' I specified 'INSTALLED' thinking that this means product is installed and the action will execute, display the error message I have specified and abort.
However, regardless of whether this product is installed or not, this action gets execute and install is aborting.
Is 'INSTALLED' not the right condition to use? Can you please advise what to specify in this case.
Also, should I place the condition in the 'Install UI Sequence' or 'Install Exec Sequence'. Sorry new to this and hence not knowing which sequence is appropriate.
You probably don't want to do what you're trying to do as displaying a message and aborting if the product is already installed means that once the product is installed, you won't be able to upgrade or remove the product. But to try and answer your questions, you probably want to use Installed and not INSTALLED and without knowing more, I'd think you'd want this to go in the Install UI Sequence.
thanks, I want to abort install if the product is installed already. But I do want users to be able to uninstall the product. You mention I should use "Installed and not INSTALLED" ? Isn't this contradictory? Meaning I am saying Installed as well as NOT Installed ?
BTW, I want the custom action to be executed in the silent installs and uninstalls. So would placing it in 'Install UI Sequence' not work for silent installs/uninstalls since they have no UI?
What I meant was that the property you are looking for is "Installed". In your original post you used an undefined property "INSTALLED". There is a difference--property names are case sensitive.
The reason I surmised that you wanted your action to be in the "Install UI Sequence" is that you said you wanted the action to display a message. You don't want to display messages in the "Install UI Execute" sequence because if you put the message there it will display if the user performs a silent (or unattended) installation.
I'd recommend you look into taking Flexera's "Learning MSI Projects Using InstallShield" class.
