Go to Control Panel > Programs and Features. If you have 32-bit Office, remove it (you can reinstall the 64-bit version later).
Before downloading Visio 2013, it's essential to ensure that your computer meets the system requirements. For the 64-bit version of Visio 2013, you will need a computer with a 64-bit processor, 4 GB of RAM (8 GB recommended), and a minimum of 3 GB of available disk space. Additionally, your computer must be running Windows 7 (SP1) or later, or Windows Server 2008 R2 (SP1) or later. microsoft visio 2013 new download 64bit