@fluidscroll The required framework version for plugins can be found in the bower.json or package.json file in the root of the plugin. Here is the one for PageNav.
Since you're running Adapt framework 5.7, you'll need to go back a few releases to find a supported version. 2.4.0 should work for you.
Subject of the issue/enhancement/features
Describe your issue here.
When I upload the plugin using the authoring tool, I receive an error stating it's not compatible with my version of Adapt (5.7.0)
Your environment
Steps to reproduce
Upload the plugin using the authoring tool
Screenshots (if you can)
Thanks!