Thank you for your interest in our product. You can download the MSI or ZIP installation. They don't need Internet to install. The tool use Internet connection only to check for newer versions so it can run without this connection. Just be sure to check our website or follow us on Twitter for the upcoming builds. And there are new things that are soon to come in JustDecompile, and are worth checking out, I promise you.
Here is a link to the MSI and ZIP installations: http://www.telerik.com/account/your-products/product-versions/single-download.aspx?pmvid=2667&pid=845
Please let me know if you need further assistance.
the Telerik team
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