Every Power-Up is available for you to use - even in the free version. We do only limit the number of Power-Ups that can be enabled on a board. As a free user you can enable one Power-Up per board, Trello Gold users up to 3 - Business Class users can activate Power-Ups without limitation.
If you encounter any issues activating the Power-Up, would you mind reaching out to trello.com/contact with a link to the board and a screenshot of any error you are seeing? We'll be happy to take a closer look.
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