AceSEF is easily installed as any Joomla component. That should be done through your site's backend.

Once you log in, you should open the Extensions => Install/Unistall section and click on the [Browse..] button in the Upload Package File section. Navigate to the same AceSEF file you have downloaded earlier and select it. Then click on the [Upload File & Install] button to start the installation.

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At the end you will be redirected to AceSEF Control Panel and see a notification that AceSEF was successfully installed.

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