Setting or Updating INSTALLDIR value from Installscript in Basic MSI

[agshah]

Hi all,

I have IS 2023 Basic MSI project. I want to set/update INSTALLDIR value from the installscript.  I tried below but does not work.

sNewInstallPath = "c:\\xyz";

INSTALLDIR = sNewInstallPath;

// or below

MsiSetProperty(hMSI, "INSTALLDIR", sNewInstallPath);

MessageBox("New INSTALLDIR location: " + INSTALLDIR, INFORMATION);

I looked at https://docs.revenera.com/installshield21helplib/helplibrary/AccessingProps-DeferredCAs.htm

It shows how to get INSTALLDIR value. Is there an example of how I can set INSTALLDIR ?

thanks.