After upgrading or changing themes, simply login to Wholesale Now or Quantity Breaks Now from the Apps section in your Shopify account. Every time you login, our apps check your theme to ensure the necessary helper files are present and, if not, adds them back in to your theme.
If you notice that the widgets are missing from your product and cart page, it may be that your account settings need to be tweaked to make our apps compatible with your new theme. Simply contact our support staff at firstname.lastname@example.org for free setup assistance.
If you have HTML/CSS/jQuery experience, you may be able to make the needed adjustments yourself. See the question "The discounted subtotal isn't appearing on my cart page for shoppers. What do I do?" above for further instructions.