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Make sure you have "arena" loaded before attempting to join the server, alternatively start quake with the command line option "+set fs_game arena"
Set "cl_allowDownload" to 1 in order to download whatever assets might be missing in your local installation from the server.
Try the following in your configuration
Config not loading
Try the following in your configuration. Replace customwidth and customheight with your resolution of choice
Put the config in the "arena" or "baseq3" folder and rename it autoexec.cfg