Newer "1.5" or "1.6" versions floating around are usually hacked skins of 1.4.0 with added bugs.
Often provided on a CD with the hardware, but can be found on community forums like E46Fanatics 64-bit USB Drivers: bmw scanner 14 0 software download windows 10 top
Instead of clicking random "Download Now" buttons, look for reputable sources in the BMW community. Newer "1