Chrome has a privacy/security setting (don't know if it's on or off by default) that will block multiple downloads from a website. The first download works, then subsequent downloads are blocked. Chrome does not give you an obvious indicator that this is happening. On the right side of the URL bar there is some icon that appears, and if you click on that icon (sorry, I forgot what it looks like!) then you can tell Chrome to allow multiple downloads from that specific website.
Actually, I am reporting the above based on my use of Chromium (not Chrome). But Chrome is built on Chromium. Chromium is the original open-source browser, Google takes Chromium, adds their own spyware and tracking stuff, and markets the result as Chrome. So since my experience with Chromium taught me about this multiple-download blocker, I am assuming that you will see the same behavior in Chrome. But you may not - Google could have removed that security feature while turning Chromium into Chrome because they intentionally want to allow multiple-downloads, possibly to assist them in their spying/tracking. Anyway - it's something worthwhile to check for.
I believe this is where the setting is stored in Chromium (I'm not sure, because I have always accessed it via the icon on the right side of the URL bar when I had a blocked download):
Settings->Advanced->Downloads->PrivacyAndSecurity->SiteSettings->AdditionalPermissions->AutomaticDownloads "Do not allow any site to download multiple files automatically"
That is poorly worded, because the setting doesn't just affect "automatic" downloads, it also affects manual downloads that are invoked rapidly one after the other. As user jhowell said above, Amazon downloads these files via Javascript, and that may be fooling the browser into thinking that the downloads are "automatic" even though you are manually initiating them.
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