It might work if you put -insecure in your launch parameters (to disable VAC and thus allow plugins to be loaded) but it's usually easier to just use a dedicated server. Plus, there are apparently some problems running SourceMod on a listen server. TF2ItemsInfo, which Bot Weapon Randomizer depends on, prevents itself from running on listen servers.
Downloading the dedicated server (using
SteamCMD) won't take as much time as downloading the full game, because the server doesn't need sounds or materials.
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