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i would like firefox 5, but when I try to install it, it only allows me to upgrade

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when i try to install firefox 5, it asks for me to upgrade. It will not allow me to install firefox 5

when i try to install firefox 5, it asks for me to upgrade. It will not allow me to install firefox 5

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That is because the installer always uses the text Upgrade when it has found an existing installation that it will replace. Just click Upgrade and it will install Firefox 5.