I've noticed a few people having problems with the vending machine in the armory never enabling after completing Dead Money in any case except where the mod was installed after completing Dead Money. I did some digging in FNVEdit and traced the problem back to the DLC update script/quest only firing once. I've taken the initiative of sharing my findings here in hopes that this can be formally fixed or added to the FAQ. You can fix the problem by standing in the Main Hall and refiring the quest using the command:
resetquest xx005021
where xx is replaced by the load order hex of the UWHNV-DLC addon. This *should* fix the problem.
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Dead Money vending machine bug workaround (1 comment)
resetquest xx005021
where xx is replaced by the load order hex of the UWHNV-DLC addon. This *should* fix the problem.