Hi all . after a lot of search i have installed my Octopus on windows 8.1 64BIT. I hope this help you.
here we go :
First of all you have to download boxdriver v5 from official site.
Go manually update driver of the "smart card reader"--> Select egate 64 bit .. like this [IMG]
http://postimg.org/image/lqvcyr343/ [/IMG]
Windows tell that is a error (ERROR 10).. don't warry,
Update smart card reader's driver one more time, but this time manually select the driver "usbccid microsoft" (is preinstalled on windows ) : [IMG]
http://postimg.org/image/7fu8ctegz/ [/IMG]
AND VOILA' OCTOPUS WORK FINE ON 64BIT S.O.
[IMG]
http://postimg.org/image/oipak2ofx/ [/IMG]
I hope this help you. Sorry for my BAD english, but i'm italian ..
peace.