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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.
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Go to chrome://extensions/ and check the box for Developer mode in the top right.
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Before check Developer Mode
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After Check Developer Mode yo will see like below image.
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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.
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Locate where the ZIP file on your computer and unzip it with WinRAR or etc.
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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.
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If you want to upload/install a pack extension click the pack extension button and upload like CRX file.
