Step 2: Search for the Windows 7 Ultimate 64-Bit ISO Note: Make sure to download the latest version of uTorrent. uTorrent is a free and open-source BitTorrent client that makes it easy and fast to download large files like ISOs. Step-by-Step Guide: Step 1: Download the uTorrentīefore downloading the Windows 7 Ultimate 64-Bit ISO, you should first download uTorrent.