The above dialog from Ableton Live means that you need to install MaxforLive.
MaxforLive is available as part of Live Suite or as a separate upgrade to Live Standard, you will be able to purchase it directly via your account at Ableton.com
For support as an existing customer please use the Support Request section within your account page, this will enable us to validate your purchase automatically and assign the request to the relevant developer to respond when they're available.