uTorrent 1.8.5 has known remote code execution (RCE) vulnerabilities (e.g., CVE-2009-1760). A malicious peer can craft a special packet that crashes your client or runs malware on your PC.
Modern uTorrent (specifically versions after 3.2.2) is often criticized for including built-in advertising modules and bundled software like EpicScale. The 2009 versions (v1.8.x) were the last to offer a and simple, utilitarian design. Summary of 2009 Release Timeline utorrent 09