This proved to be potentially problematic if a consumer found a product online but chose to purchase it in the store or from the contact center.

FORBES: Can Omni-Channel Retail Combat Showrooming?

Independent travellers can also contact a tour operator solely to purchase tickets, or reserve tickets through one of the many hotels that dot the rural Sacred Valley between the city of Cusco and the town of Aguas Calientes, the gateway town to Machu Picchu.

BBC: Securing tickets for Machu Picchu

Also note that if eligibility cannot be determined online, you may need to contact Microsoft customer support and provide proof of your PC purchase.

FORBES: Get A Windows 8 Upgrade For $14.99