Easiest method - Use the Block Kit theme

The Block Kit 1.3 theme has the rapidweaver.org framework build into it. The Blocks/Stacks will only display in preview mode if you have this theme selected, or if you use one of the other methods described to add the framework to another theme.

Install the theme

1) Open the dmg file from rapidweaver.org. Double click the theme. This should open the theme in Rapidweaver.

Apply the theme

1) Select themes

2) Choose Block Kit 1.3 as your theme. If Block Kit 1.3 is not there you will need to restart rapidweaver.