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Can't download Adobe Flash Plugin 21.0.r0 - get 413 error Headr Length too large

Invision
Invision
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The Firefox website is telling me that the Adobe Flash Plugin is a critical update. But when I click on the button to download it I get the message "413 Header Length too large" - so I am unable to download the update. I am using Firefox 46.0.1 on a Mac running OS 10.9.5.

The Firefox website is telling me that the Adobe Flash Plugin is a critical update. But when I click on the button to download it I get the message "413 Header Length too large" - so I am unable to download the update. I am using Firefox 46.0.1 on a Mac running OS 10.9.5.

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jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
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That's an unusual message. It may mean that Firefox is trying to send too many cookies to Adobe's site.

Does it work any better to download from the following page:

https://www.adobe.com/products/flashplayer/distribution3.html

Scroll down to the first table and look for the line that has Mac for Safari, Firefox and Netscape Plug-In.

If you need to clear Adobe cookies, while viewing a page on the site, try either:

  • right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info > Security > "View Cookies"
  • (menu bar) Tools > Page Info > Security > "View Cookies"
  • click the padlock or "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button

In the dialog that opens, the current site should be pre-filled in the search box at the top of the dialog so you can remove that site's cookies individually.

Then try reloading the page and downloading again. Does that help?