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If you have trouble upgrading (there is one step where an old password is requested, which can be difficult to figure out), you should delete the MySQL data,
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When you select the product ("MySQL Server 5..21 below), the installer crashes with something about a string and datetime error.
While this will probably be fixed, as of October 20134, to work around the bug, go to Region as below (Control Panel); change the Location to United States, then the Format to English (United States). Click Apply to keep the Window open, so you can easily change it back when done.
