Now the free community edition of bull zip philosophy is available still on the internet. So it can play the important role in maintaining the software which is afforded to use. If this software can be used in small company means less than 10 installations to be needed, then only run your projects by using this software. Now most of the sites introduced the PDF download so you can install it anywhere from the websites.
At the time of normal installations, it will suggest the installer to download the prerequisites in that part to be installed. It can be available to install without internet in offline mode, you can download from the internet and at any time you can make the setup their connections even in offline mode. All kinds of tools which are helps to setup their files during download they will ask for that reason they preferred offline mode.