Seems to be a corrupted xml file on the server, we're working on it. Sorry for the problems guys.
Nice (for us at least) to see you being vigilant and working on a Friday night, though I think you may not be that happy about it.
If I may make 2 suggestions though, concerning the verification process.
1) Since you do have a way to ensure the hash of a file, be that crc or md5 hash, can you also supply them to us, so we can verify that the installers are correct, or that they have been updated?
2) I think/guess that the current verification process is a size one, since when I tried to install Conquest of the New World earlier today, to check what DosBox version it had, the integrity check from the setup failed, but the downloader claimed everything was fine. Can we get an option to "Force re-check", which will do a proper hash check? In case the downloader actually does a proper hash check, then the question is why the integrity check failed...
Hope you get the xml fixed soon, and enjoy your Friday Night.