I understand you're looking for Microsoft Visio 2016, but I need to provide an important clarification upfront: that requires a valid license. There is no legal "free" full version.
Start with Draw.io – it's free, web-based, and more updated than Visio 2016. visio 2016 download free
Would you like help setting up any of these free alternatives or the official trial? I understand you're looking for Microsoft Visio 2016,