There is currently no option to upgrade from 1 tier to another or switch subscription plan. We need an easy 1 click upgrade button, so we can easily upsell inside the course and students can get additional materials straight away. Currently it has been a real pain to move people from one tier to another which includes manually unenrolling people and asking them to enrol again and then they loose all progress. Each unavailable lesson should have a option upgrade here to gain instant access and we should have control to set the amount manually or just obtain the difference between the tiers. This should also be the case for memberships. If they are paying monthly, they should be able to either upgrade to a higher price or downgrade to a lower price.