If you are using Mozilla Firefox browser on the latest of Microsoft Windows OS, Windows 7, you may encounter File Access Error while downloading files using DownThemAll plugin. I am using Mozilla Firefox v3.5.4 with DownThemAll v1.1.7.

This is not a DownThemAll bug. This problem occur because of User Access Control in Windows 7 that prevent creating and/or modifying files (including newly created downloaded files) on some directory without Administrator access.

To solve this problem, you either need to start the Mozilla Firefox browser as Administrator or disable Microsoft Windows 7 User Access Control (UAC) completely. I prefer the first option, because it is only affect to the browser, not to the entire running application.

Hope this helps!