How To Access User Properties From InstallScript
If I create a property using Property Manager, I can see the property in dropdowns for various predefined scenarios, such as conditions, etc. But I cannot see the property inside InstallScript. If I just type it, I get an Undefined error at compile time. What do you have to do to access such a property from InstallScript?
I believe you are using either BasicMsi or InstallScript MSI project as property manager view is available in those projects only.
you can use MsiGetProperty and MsiSetProperty methods to access properties from script. You can refer below link