Detecting First-Time Installations, Maintenance Mode, and Uninstallation
InstallShield 2024
Project:
| • | Basic MSI |
| • | DIM |
| • | InstallScript |
| • | InstallScript MSI |
| • | Merge Module |
| • | MSI Database |
| • | MSM Database |
| • | Transform |
Your installation can determine whether the installation is being run for the first time on a target system.
Windows Installer–Based Projects
In the Windows Installer sequences, the following conditions detect certain types of installation:
| • | First-time installation: Not Installed |
| • | Maintenance: Installed |
| • | Uninstallation: REMOVE="ALL" (after the InstallValidate action) |
You can use these conditions in any of the Condition settings of a Basic MSI or InstallScript MSI project.
InstallScript-Based Projects
In InstallScript, the MAINTENANCE variable is FALSE for a first-time installation, and TRUE for maintenance mode or uninstallation. Therefore, you can use an if-statement like the following for any code you want to run only for a first-time installation.
if (!MAINTENANCE) then
// code to run for first-time installation
endif;
You can use that sort of code in event-driven InstallScript code of InstallScript and InstallScript MSI projects.
See Also