Thanks for the new 64-bit version of JRiver MC23.
Seems to run smoothly here, except: as others have reported downloading MC 23.0.60 64-bit meant loosing ones registration info, but that was fixed by restoring the registration code - as was proposed here.
Moreover, as recommended by the admin I uninstalled MC23 32-bit, but once done the MC icon in the process line at the bottom of the screen, used for easy 1-click activation of MC, was no longer functioning - of course since MC23 32-bit had been uninstalled. But how do I (re-)create the same 1-click easy access for MC23 64-bit? We can only downloaded the specific build 23.0.60, and so every time the program runs its installation process instead of simply opening MC immediately. Sorry if there's an easy (i.e.: obvious) fix for this, but I'm a PC novice..
Lastly, upon downloading MC23 64-bit and restoring the registration code my 64-bit W10 Pro called for some updates, which I then did, but after restart I couldn't get any sound from Blu-ray playback. Checked all settings, all seemed OK. Then I restarted again, and this time around a pop-up window alerted me of something like "Failed to open parse file 00045-ish"(??) Tried numerous times to get the Blu-ray disc to play, but to no avail. Then I chose to uninstall the latest Windows updates I'd just made (thank god this is possible), and after restart I was yet again able to play back my Blu-rays - with sound. Could this indicate a problem with the new Windows updates and MC23 64-bit (and even the 32-bit version)? Upcoming Windows 10 updates to my knowledge cannot be skipped - only temporarily..