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Windows 7 - "Thunderbird Setup 31.6.0 is not a valid Win32 application"

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Trying to execute Thunderbird Setup 31.6.0.exe on Windows 7 gets "Thunderbird Setup 31.6.0.exe is not a valid Win32 application"

Trying to execute Thunderbird Setup 31.6.0.exe on Windows 7 gets "Thunderbird Setup 31.6.0.exe is not a valid Win32 application"

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did you download from getthunderbird.com?

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Yes. Resolved the problem by rebooting, clearing cache, and downloading a second time.