The Canon Log upgrade will be available as a chargeable service exclusively via Canon authorised service-centres. The upgrade service is available within Europe from 28 June 2017 and within the US it's scheduled to be available through authorised Canon Factory Service Centres in July 2017. We advise that you check your local Canon website for service information in your area.
For more information visit:
http://www.canon-europe.com/support/consumer_products/products/cameras/digital_slr/eos-5d-mark-iv.aspx?type=important&faqdetailid=tcm:13-1564487