Following this guide reduces “license lost” errors, speeds up large case solving by 20–40%, and prevents database corruption.

• Pre-installation system hygiene and licensing preparation.
• Selective feature installation to reduce bloat and conflicts.
• Post-installation tuning of memory, SQL, and antivirus exclusions.
• Validation of critical functions (solver, database, license).

• Network License: If using a server, ensure the port@server syntax is correct. The license manager must be configured to point to the correct .lic file.
• Local License: If using a local license file, the "Better" approach is to manually copy the license file to a static directory (e.g., C:\Aspen\Licenses) and point the Aspen License Manager to that folder, rather than letting the installer guess the location.

2. Critical Pre-Steps

• Disable Antivirus & Windows Defender temporarily. Real-time scanning will corrupt installation of license managers and database components.
• Run Windows Update first. Ensure all .NET Framework and C++ Redistributable updates are installed.
• Create a System Restore Point. This is your safety net.
• Close all Office apps. Especially Outlook and Excel—the installation modifies system ODBC and registry keys.

• Uninstall via Control Panel > Programs and Features
• Run the AspenClean utility (available from AspenTech support) or manually delete: