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You need to do this, otherwise you will not be able to retrieve the ID and update URL.
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The first thing to do, is to manually install the extension directly from the Chrome Web Store on your (test) system. For example, the concatenated string of the extension ID and update URL for the Office Online extension version 1.5.2. These two values have to be entered as one string, but separated by a semicolon ( ). To be able to add an extension to a Group Policy, two values need to be known: the extension ID and an "update" URL. Retrieve the extension ID and update URL of the Chrome extension
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