If I missed buying the EMF Pack during the promo (discounted price of $67)... can I still buy it?

Yes. You can still purchase it at any time, at the regular price, by visiting https://theemfguy.com/checkouts/summit-watch-ended/

During the 48-hour viewing window, the EMF Hazards: Safeguard Our Future Pack will be $67. After the free viewing window has expired, the price will go up. Unfortunately, we don't plan to extend the $67 deal or make exceptions.