Can't update Slider Revolution

When I try to update the Slider Revolution Plugin, it gives me the error: Update package not available.  Everything else in my install is up-to-date and I'm having a problem with the menu not showing up on the homepage of our site only (which uses Revolution Slider): https://www.pretrial.org I'm hoping updating the plugin will help.

I deregistered and re-registered the theme and am still unable to update rev slider from 6.2.2 to 6.2.22

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