I've uploaded all the files and get all green checkmarks. I enter in the database and email information and I get this...

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Not Found

The requested URL /mysite/mysite/index.php/install/-/configure/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
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I've even tried to install an older version I had and got the same message. Not sure what's going on. I know the install is simple.

Any ideas?