You don't need an internet connection to install them
You do need to be able to download the installation files and get them on to your server, and once installed, if you want to add any add-ons, you'll have to download them and install them via the "upload" option. But you don't need internet access to do anything (it is easier, but not necessary)
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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