I'm having the same issue described by JPG above. I currently have Orion version 0.99.114.2-rc.
Click "Check for Updates" it tells me 0.99.115.1-rc is available.
Click "Install Update" and I get "Update Error! Failed to extract update...cancel".
MacBook Retina, 12-inch, Early 2015, Big Sur 11.6.7. I tried restarting the Mac but did not help.