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Upgrade 3.6.15 won't download. It seems to be stuck in a loop.

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I keep getting a pop-up message that I need to download the new version 3.6.15 for important security reasons. When I try to do it, it says "Downloading Update" with the little bar and blue lines going across and "Connecting to update Server" at the bottom, but nothing happens. I left it going once for 30 minutes. Nothing. I am currently running 3.6.13.

I keep getting a pop-up message that I need to download the new version 3.6.15 for important security reasons. When I try to do it, it says "Downloading Update" with the little bar and blue lines going across and "Connecting to update Server" at the bottom, but nothing happens. I left it going once for 30 minutes. Nothing. I am currently running 3.6.13.

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