Firefox 4 for MAC would not upgrade-says I don't have permissions. Now I don't have Firefox on my MAC

I was asked to download the latest version of Firefox. I did so and when I went to install it, I got the error message that implied I didn't have authorization to run some of the features. The upgrade stopped and now Firefox will not run because it says it is locked. I am running Firefox on the PC side of my MAC to ask for the fix. (I'm running Parallels.) I have one of the original Intel MAC laptops. Please give me the link to an older version so I can restore Firefox.

If you have problems with updating or with the permissions then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.
Download a new copy of the Firefox program and save the DMG file to the desktop
* Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Trash the current Firefox application to do a clean (re-)install
* Install the new version that you have downloaded
Your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks and other personal data.

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