Help me understand Progress Bar pricing
The pricing plans are available here:

You will see All Other Widgets under each plan. This is how many times you can use widgets that fall under this category (including the Progress Bar widget) in a month. One use event occurs each time you initialize a progress bar. For example, in a scenario where your course contains a progress bar that you initialize when the course first opens, and 5 learners open your course: you will use 5 credits.

You can track your current usage and your remaining credits on this page:

There is a default email notification that goes out when you exhaust 80% of the credits for the month, so this will give you enough time to make arrangements if needed. You can choose to upgrade to the next plan if you’d like to keep progress bars in your courses or do nothing. If you run out of credits, you will not be able to use progress bars for the remainder of the billing period, and the credits will reset with the next billing cycle. You can verify that the notification is turned on (or turn it off if needed) on the Account page.