I spent a good bit of time trying to upgrade from MC19 to MC20. Nothing seemed to work. So I got connected to the Interact site, logged in and again, things were going from bad to worse. The keys on any of my Macs would not work, I could not back space, could not type correctly, could not ask any questions. Sent a note to JRiver corporate as there is no contact information outside the Interact Forum and I could not access that as JRiver would not recognized normal key strokes from my Macs. Then I did the oddest thing. Instead of trying to access JRiver from my links in the dock that has all my audio I opened a new site and everything works fine. Why you have all this on the audio cover page and nothing works is beyond me. Perhaps some instruction as it is intuitive to access JRiver from my normal JRiver tab on the Mac dock.
All is fixed now but boy, software people don't think things through for the common guy much.
MC20 downloaded fine once I didn't follow directions and my library transferred over in just a few minutes.
David.