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Firefox 50 setup downloads and unzips but does not install

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After I click on "Firefox Setup 50.0.exe", the dialog box ("7-Zip") extracts 100% of files and says "The operation completed successfully." But nothing happens.

After I click on "Firefox Setup 50.0.exe", the dialog box ("7-Zip") extracts 100% of files and says "The operation completed successfully." But nothing happens.

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Try using some other software (like winrar) for unzipping/extracting.