Client is stuck on version 26.7
We typically have to restore after attempting the update. The backend fails to load afterwards.
I fixed that issue, the license was registered to the dev server. I reregistered it to the proper domain. That said, Slider Revolution will not update from within the plugins tab. It says update, you click it and it shows active, but it doesn't actually update.
Good to see that you handled the theme update.
About the SR update, remove this plugin, and install it again, and you will have the newest version.