A few pages back there's a wget statement (posted by Knuddi I believe). That download's the 'lat-procmail' executable. You may or may not have to chmod it to make it executable.
After you have the program downloaded, you run:
./lat-procmail -c "*|enabled|no|some|normal"
If you're not running lat-procmail from the directory you downloaded it to, you need to specify the path.
For example, if you downloaded it to /root/, but you're in /home/e-smith/files/users/admin, run:
/root/lat-procmail -c "*|enabled|no|some|normal