Can I upgrade or switch from one plan to another?
Updated
Plans cannot be converted or upgraded after purchase. Each account type is a separate product with its own rules and drawdown mechanics. If you'd like to try a different plan, you would need to purchase a new account.
The same goes for the daily loss limit option on Flex. You choose it at checkout, and it can't be added or removed afterwards.
This includes moving between Flex and Daily Payouts. You can hold both at the same time, since account limits are counted separately for each product type. If you are weighing the two up, see Daily Payouts or Flex Challenge: which should I choose?