You can install VS Code extensions offline by following these steps:
- Download the extension file (.vsix) from the VS Code Marketplace on a computer with internet access.
- Transfer the downloaded file to the computer without internet access using a USB drive or similar method.
- Open VS Code on the offline computer and press Ctrl + Shift + X to open the Extensions panel.
- Click on the three dots icon in the Extensions panel and select "Install from VSIX"
- Navigate to the location where you transferred the extension file and select it.
- VS Code will install the extension offline.
Note: Some extensions may have dependencies or require an active internet connection for activation or updates.