Cauldron will not be downloadable, unless you managed to snag a 1.7.10 release before the bukkit fiasco.
But I never knew there was anything wrong with the DW20 server files, just people not knowing how to use them.
Also, just a suggestion, if you are trying to make a public server that will get attention don't use DW20, there are already a lot of servers like that.
The only reason I make this assumption is you never stated you were running it home-brew (using your PC to run the server), and IF you had Cauldron, running it on a computer may make the server laggy.