Drupal drush

It's forbidden to download drupal core into an existing core.

you are not allowed to download drupal7 into existing drupal 6 site. The .htaccess will complain, Set up your D7 site in a different directory, and use a rewrite rule in your Apache configuration file to alias mysite.com/d7 to your Drupal 7 site. That would work. Apache config not supported here, though.

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