Since your target machine has no internet access, you must first use a computer with an active connection to gather the necessary files.
You should now see a list of extensions available from your local source.
If you can’t simply hit "update" within the software, here is the step-by-step guide to managing an Altium extension offline installation. Phase 1: Preparing the Offline Installation Files altium extension offline install
Under the section, locate the Offline Installation option. Check the box for Use a local installation service .
Once the path is set, Altium will "see" the extensions available in that folder as if they were live on the web. Stay in the tab. Click on the Purchased or Installed sub-tab. Since your target machine has no internet access,
Click the button (the gear icon) in the top right corner.
Copy the entire installation package (which includes the extensions folder) onto a secure USB drive or a dedicated internal network share that the air-gapped machine can reach. Phase 2: Configuring the Local Installation Service Phase 1: Preparing the Offline Installation Files Under
Click the (download icon) next to the specific extension you need (e.g., Draftsman or KiCad Importer ).
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?
In the path field, browse to the folder on your USB or network drive where you stored the offline repository files. Phase 3: Installing the Extension