IE 11 can be enabled from Run (Win+r), then type optionalfeatures for the legacy Windows Features program. Then check the box for IE 11 and OK, then restart when prompted. Obviously IE is old, so it is best to disconnect you quickbooks from the internet if you are using it on one PC and let IE exist on your Windows 10 PC. This needs a solution though, I was very close to adding "disable IE 11" to all new Windows 10 Pro installs. Hopefully a good business-class endpoint security application can help with the shortcomings of IE 11, but I'm no security expert.