I've checked my files and I don't have 10_1909 - mine only goes up to 10_1903 but my Pro 4.6.1 opens fine.
Can you boot up into Safe Mode and Networking and uninstall that version of WR and then reinstall while in Safe Mode, should something on your computer be corrupting the download/install.
While you are in that mode, run the program to see if you still get that error.