Click the button (the gear icon) in the top right corner.
Even with extensions installed, remember that your Altium License must also be handled offline using a .alf license file, as the software cannot "phone home" to the Altium On-Demand license server. Why Install Offline? altium extension offline install
Since your target machine has no internet access, you must first use a computer with an active connection to gather the necessary files. Click the button (the gear icon) in the top right corner
A progress bar will appear. Once finished, Altium will prompt you to restart the application to finalize the integration. Troubleshooting Common Issues Since your target machine has no internet access,
Click the (download icon) next to the specific extension you need (e.g., Draftsman or KiCad Importer ).
Ensure you have the main offline installer for your specific version of Altium Designer. Extensions are often version-specific.
Under the section, locate the Offline Installation option. Check the box for Use a local installation service .