If you absolutely cannot get the InstallShield 3 generic installer to work on Windows 10/11, stop fighting the OS. Instead, embrace virtualization:
If you are distributing new software, do not use InstallShield 3. It is a security risk (no SHA-2 signing support) and a UX nightmare for modern users. Look into WiX Toolset , Inno Setup , or Advanced Installer . installshield 3 32-bit generic installer
Only run the generic installer in an isolated, air-gapped virtual machine or on a network segment with no internet access. If you absolutely cannot get the InstallShield 3
If you are maintaining a legacy application and considering rewriting the installer, do not build a new project around InstallShield 3. Instead, repackage the legacy app using: Look into WiX Toolset , Inno Setup , or Advanced Installer
If you see a 16-bit subsystem error (e.g., "The program requires a 16-bit library"), you are likely not using a pure 32-bit generic installer. If you see "Error -1603: Fatal error during installation", it is a permissions or disk space issue.
Using a 28-year-old installer on a modern network carries risks: