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So I recently wanted to try SPARC NextStep and tried to get that archive.
But when I run the download, it shows me ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION.
Seems to work fine for me.
I've just rechecked and still the same. If it's fine for you, probably my host is screwing something up.
Just did a quick web search for that error. Apparently there is a bug in google crumb that makes it barf on file names with commas in it. That is ridiculous. Meh. Use Firefox :P