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The product is a so called progressive web app (PWA) after first startup it will be downloaded and saved in your browser cache. As long you do not delete your browser history you can use the product offline. Please only make sure that the license can be checked within 21 days. Please see bellow. You don’t need to do anything extra to use it offline you can open it as usual.
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As seen in the screenshot above the tool will show on the main page on the right the version number and if it is offline available.
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