When I try to download 6.0 I get a message saying it could not be opened

Refuses to download

If you can read the message you could provide the exact wording.
With the exact wording somebody could pull up more information from a search here, or through Google. That could even be you.
However since we have gone from 4.0 to 5.0 to 6.0, you might check out Fire Wall problems.
* Firewalls - MozillaZine Knowledge Base<br>http://kb.mozillazine.org/Firewalls
* Firewalls | How to | Firefox Help<br>https://support.mozilla.com/kb/Firewalls

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