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I can no longer download files. The download manager comes up and indicates file is downloading, but it isn't.

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I can't download any files. The download window appears and indicates file is downloading, but it doesn't. I had to open IE to download latest version of Firefox. I have reset all download values to default. I have changed the location of file downloads and I've cleared the download manager.

I can't download any files. The download window appears and indicates file is downloading, but it doesn't. I had to open IE to download latest version of Firefox. I have reset all download values to default. I have changed the location of file downloads and I've cleared the download manager.

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It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox.
Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.

See "Disable virus scanning in Firefox preferences - Windows"

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I disabled my McAfee real time scanning but it did not help. When I attempted to download a file, it showed in the download manager window but then when I tried to open it, file was not there.

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Try searching for the name of the apparently downloaded file. It may be in an odd location.

It is generally easier to download to Desktop.

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I have tried this. I've changed the download folder, created a new one and still doesn't work. See attached. The download bar appears as if the file is downloading. When I right click it to open the file after it is downloaded, the open command is in light grey and I can't open the file. When I try to locate the file using search, I get the message shown on the attached.

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You can find the original download location if you paste the code posted in this link in the Code field in the Error Console and click the Evaluate button.

That will give a pop-up with data about the currently selected file in the Download Manager window.
That same data appears as a tooltip if you hover the icon at the left side of an entry in the Download Manager.

If the files are missing in that location then there must be some software running that deleted the files.

Did you disable the virus check initiated by Firefox as well?

See "Disable virus scanning in Firefox preferences - Windows":

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I have tried all of the above and nothing helps. I created a new profile and was still unable to download files. Should I remove Firefox and reinstall it???