Heretic II demo (41 MB) from one of these locations:
gateway (5 smaller files for easier downloading)
Download the fix
for the first version of the demo. All current versions (links from above)
don't require the fix.
... This file
was accidently truncated in the first version of the demo. Download
it if you are having trouble with it. The fix is not required for the
new version of the demo (see above).