"uTorrent 0.9 exclusive" often refers to the Mac-exclusive beta phase

Early versions were famously tiny. While version 1.1 was under 100KB, the 0.9 Mac versions were larger (around 1.5MB) because they included different graphical assets and code structures. 3. Key "Features" of the 0.9 Series

During the late 2000s, uTorrent for Mac was a highly anticipated "exclusive" development project. While Windows users were already on versions 1.7 and 1.8, the Mac version was built from the ground up to be "Mac-friendly" and suit the Leopard GUI. Version 0.9.0.5: Released as a DMG image for Mac OS 10.5. Version 0.9.1.1: A notable early build that suffered from 100% CPU usage