DOOM II - HELL ON EARTH v1.7-1.7a UPGRADE
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Official patch by id Software to upgrade DOOM
II v1.7 to DOOM II v1.7a. You must own DOOM
II to use this patch, it will NOT upgrade
DOOM 1.666 to DOOM II! You can check the
version when DOOM II starts - if it says 1.7,
download this file.  If it says 1.666,
download DOOM2P16.ZIP