Open a design file, and select a filled vector on canvas with equal "stroke" weight, then navigate to Menu > Plugins > Outline to Single Stroke to launch the plugin.
Input the correct stroke weight
On the left column, you will see all corresponding stroke weight pre-measured for each icon group, make sure to input exactly the value as shown.
Stroke weights are essential for the plugin to know what to expect when dealing with specific set of vector drawings.
Tip: You can run the plugin on multiple selection, provided that they all pertains to the same stroke weight. Make sure to press ↩︎ enough times till there are nothing else but vectors in your selection.