Guys, i was using latest uTorrent pro version, but creating new files was giving me error of memory allocation failed. So i tried so many times with that to create torrent large files of 10gb+, but at the end my HDD got crashed, not only in my desktop but also i faced same problem in my Laptop.
But then i got the suggestion from admins/staffs about 2.2.1 and it's really best, no need crack, it's ad free and bug free. And now i can make large torrent files as well.
Enjoy torrenting and keep seeding = sharing.