I just went to the first page (of this thread) and clicked on the link - it downloaded fine. In any case... here's the basics of what it says:
1. Start HL and on the system select page, click on "Find Updates"
2. Near the bottom of the new screen, click on "Add Source"
3. Click the "New Source" button and type in the URL:
http://www.shadowsoftware.net/herolab/d20/updates.xml
4. Click on "OK", then "OK" again.
5. Restart HL.
6. Click on "Find Updates" and now scroll down the list of updates and find "d20 Community Set(v1.31)" Click "Download"
7. Click "Start Import". Once this has run, you have the Community files installed, and can go back and start HL again as normal.