I downloaded lastpass_x64.exe version 4.1.23 onto Windows 10 Home 64-bit. When I try to start Internet Explorer 11.576.14393.0, I get an error message saying "Internet Explorer has stopped working".
This FAQ says the solution is to disable a security feature called "Enhanced Protected Mode":http://www.lastPass.com/support.php?cmd=showfaq&id=9482
I find it suspicious that LastPass is asking us to disable a security feature. Also, "Enhanced Protected Mode" actually worked
with lastpass_x64.exe version 4.0.0 on Windows 7 Home Premium SP1 64-bit. I suspect there is something else going on here.