Can't find extension SketchUp Free

Hey guys where can I find extension? I just downloaded sketchup this year

There are no Extensions in SketchUp Free.

If there are no extensions is there an alternative way for me to use flowify?

I presume since you are using SketchUp Free, you are a hobbyist. You could use SketchUp 2017 Make. Flowify works in the desktop versions.

Alright, I shall try it. Thanks.