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Unable to install or use former version

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Michael Little
Michael Little
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I just downloaded Firefox 4 for Mac and it will not install. When I move firefox to the applications folder , I get the message, "An older item named “Firefox.app” already exists in this location. Do you want to replace it with the newer one you’re moving?" When I say yes, I get the message, " The operation can’t be completed because you don’t have permission to access some of the items." If I try to open Firefox, I get the message from Finder, , You can't open the application Firefox.app because it may be damaged or incomplete." What, pray tell, may I do to rectify this distressing situation?

I just downloaded Firefox 4 for Mac and it will not install. When I move firefox to the applications folder , I get the message, "An older item named “Firefox.app” already exists in this location. Do you want to replace it with the newer one you’re moving?" When I say yes, I get the message, " The operation can’t be completed because you don’t have permission to access some of the items." If I try to open Firefox, I get the message from Finder, , You can't open the application Firefox.app because it may be damaged or incomplete." What, pray tell, may I do to rectify this distressing situation?