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how to install 9.0 version after uprade from 3.6 9.0 downloaded but will not install

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upgraded 3.6 version to 9.0 version. 9.0version down loaded but i can not get 9.0 version to install

upgraded 3.6 version to 9.0 version. 9.0version down loaded but i can not get 9.0 version to install

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Saafara yiñ Tànn