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David, all your modules don't have download links, only Jara's test module has (search for "jara"). When I click the JaraTest download link, it shows the NBM as text file in my browser.
I think Jara deleted his plugin because I can't find it. I tested this and I'm getting an NBM but it's not a valid Jar so there is some problem with the download.
*** Issue 96689 has been marked as a duplicate of this issue. ***
I had to totally change the download implementation. Before I was redirecting to the file and letting the browser take over. Instead, I had to read the file and spit it out in the response.outputstream after setting the response.header and the response.contenttype="application/x-download"; This fix will be pushed out this evening.
I had the same problem and it works fine now. Marking as Verified.