1. Download the CRX file to your computer for the Chrome extension that you want to install if available/some website provide a link to download .Zip file.

  2. Go to chrome://extensions/ and check the box for Developer mode in the top right.

  3. Before check Developer Mode
    dd710974-4a5e-4861-9c09-830d7063fff7-image.png

  4. After Check Developer Mode yo will see like below image.
    37f454b4-2daf-485b-b498-d3bf5a201472-image.png

  5. if you have CRX file then use a CRX Extractor app – I used CRX Extractor – to unpack the CRX file and turn it into a ZIP file.

  6. Locate where the ZIP file on your computer and unzip it with WinRAR or etc.

  7. Now go back to the chrome://extensions/ page and click the Load unpacked extension button and select the unzipped folder for your extension to install it.
    528d7e7a-988c-46ed-b76b-692de4a68f81-image.png

  8. If you want to upload/install a pack extension click the pack extension button and upload like CRX file.
    65cc71b8-b786-4ad4-8511-4f2dd4d53998-image.png