Restart Altium. When you go back to the "Extensions and Updates" page, you should see the extensions listed as available for installation even though you are offline. Method 2: Manual Installation via MPC Files
Before clicking "Apply Changes", navigate to Altium’s temporary download cache directory, typically located at: C:\ProgramData\Altium\Altium Designer Your-Version-GUID\Extensions\
Locate the folder corresponding to the extension you need. The folders are usually named after the extension or use a unique alphanumeric identifier. Step 2: Copy and Paste to the Offline PC Copy the specific extension folder to your USB drive.
Since the standard installer requires an active internet connection, you must download a standalone package first:
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: Ensure the folder containing your extensions is not set to "Read-only," as this can sometimes prevent the installer from accessing files correctly.
What of Altium Designer are you currently running? Which specific extension are you trying to install?
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Understanding that these optional components exist as separate entities is the first step toward effectively managing them in an offline environment. All management of these extensions, both online and offline, is centralized in the view. From there, you can browse, install, update, or remove any extension at any time. Restart Altium
AltiumInstaller.exe --download-extension "Altium.PcbDesign" --output-dir D:\AltiumOfflineRepo
The offline repository executable downloaded from Altium represents a snapshot of a specific software version. If an extension was released after that offline installer package was compiled, it will not be present. You must download an updated offline repository package from the Altium portal. License Activation Failures
In the text field provided, use the browse button to select the path to the folder containing the unzipped offline installer (this folder should contain the "Extensions" subfolder). Click to save changes. 3. Install the Extension
The page will display available extensions sourced directly from your local AIS. Click the icon on the desired extension. Restart Altium Designer when prompted to apply changes. Method 2: Manual Offline Installation via Local Files The folders are usually named after the extension
On day three the security team approved the runtime for limited use; the extension updated to enable full plotting. The antenna layout passed signal checks and cleared for fabrication. At the final design review, Jonah—on a patchy video call from parental leave—smiled when Mira walked through the steps. He added a succinct note to the wiki: “Always verify hashes, match Altium build, check manifest for dependencies, request exceptions early.” Mira turned the page in her notebook, saved the steps she’d taken in the project repository, and relished the quiet victory: an offline install done right, with auditability and policy intact.
: You may need to provide a reason for the request (e.g., network security or firewall restrictions). Once approved, a download link for a large ZIP file (approx. 3GB for newer versions) will be provided.
: Once extracted, you point Altium's preferences to the local unzipped folder. You can then manage extensions through the standard "Extensions and Updates" interface, which will pull data from your local drive instead of the web. Update Limitations