Hi Katrina, and welcome to the Community! 
Absolutely! We’re both maintaining and actively developing Papyrus Author. The latest update is from Dec. 2023: Papyrus Author 11.09e Update.
You can find all the release notes in the News section: Papyrus Author News
Yep!
Before subscribing, I’d recommend trying out the free version. Maybe bring in a work-in-progress if you have one, and explore the features to get a feel for it.
Upgrading to Papyrus Author+ is easy—your free version updates automatically when you restart it after subscribing.
I’d love to hear what you’re working on! 
There are a lot of features packed into Papyrus Author. Depending on what’s next for you, here are some videos on the most used features: Papyrus Author Playlists
Have fun! 
