Seems like Windows 10 "App & Browser control" just made it impossible for me to run #BeakerBrowser on my PC running version 2004 (OS Build 19041.610). Or could also be "Controlled Folder Access" that is blocking. Windows 10 is getting really close to becoming a completely locked-down - yet safe for everyone - to use operating system. But not super friendly for hackers or tinkerers like myself.