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At cryptoparty many people are going to want to download new software on the night, and Electron Workshop's wifi is going to get hammered. You can make the whole thing quicker (and maintain better security) by downloading some stuff in advance.
Linux users should download software using their package manager (e.g. apt, synaptic, yum, ubuntu software center). Tip: if using apt you can download the pacakges without actually installing them by using the download only option e.g. sudo apt-get --download-only install pidgin-otr
.