The newest patch for the Windows version of Eschalon: Book I is online. You can grab the patch over on the Book I page, and the fixes can be seen here. This is a minor update, just to get the Windows version up on the same level as the newly released Macintosh version.
We've also posted a link to the beta version of the Linux demo. We are still trying to work out some problems, but if you are a Linux user and want to give the demo a try, download it and let us know how it runs on your system.