CMS Made Simple Forums

I have an old web site which used the Forum Made Simple module and I am now trying to implement it in a new site, but I cannot find this module anywhere. Has it died a natural death? Is there a replacement module anyone can recommend (hopefully one that I can import all the old messages to)?

Thanks, I am unable to install that module because of the same DTD mismatch problem. I have tried comparing XML files but really don't have a clue what I need to change in the XML file so it will import.

I copied the forum folder from my old site and created the tables and populated the data from a backup of the old site, then chose the Install option in the Modules page and this seems to have me working again.