Yes, these algorithms are free for existing H90 owners. You must first update to the latest version of H90 Control (1.9.13) and then update to firmware (1.11.4) from within the app.

I recommend you subscribe to the following forums to be notified of future changes.
https://www.eventideaudio.com/forums/topic/h90-control-latest-h90-control-1-9-13/
https://www.eventideaudio.com/forums/topic/h90-software-latest-h90-release-1-11-4/