Tried using this plugin with WordPress 4.1 for FB tracking scripts – code doesn’t get saved when updating page

https://www.ads-software.com/plugins/per-post-scripts-and-styles/

I had a simple javascript script to place in the footer but it doesn’t show. This plugin hasn’t been updated in almost 2 years.

https://www.ads-software.com/plugins/per-post-scripts-and-styles/

Is this still supported?
The link is broken in this sentence:

For complete documentation, visit philipwalton.com

https://www.ads-software.com/extend/plugins/per-post-scripts-and-styles/