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[John Gardner]

I think the installer should handle the situation where the user installs over an old build (same folder)

It either should:
1. Handle it.
2. Offer to uninstall previous version
3. Warn the user.

But you should not end up with a non-functional install.

BTW, when re-installing I got the defualt paths but when I initially installed 6.4 it came up with the old install path for 5.7

But I am up and running now. So thanks.