2. Go to 'Plugins' page on your WordPress site and click 'Add New' button on top of the page
3. Upload downloaded .zip file, then click 'Activate' button when uploading will be finished
Important! After installation you should accept EULA, if you don't do this, Accelerator settings shows blank page! You can't do this if admin notifications on your WP are disabled. Please, enable admin notifications first.