The short answer:
Do not download any file claiming to be "Visio for Mac OS X." Use Draw.io (diagrams.net) for free, or pay for Lucidchart if you need professional Visio file compatibility. If your employer requires real Visio, ask them for a Windows laptop or a Remote Desktop license. Microsoft Visio Free Download For Mac Os X - Google
The short answer:
Do not download any file claiming to be "Visio for Mac OS X." Use Draw.io (diagrams.net) for free, or pay for Lucidchart if you need professional Visio file compatibility. If your employer requires real Visio, ask them for a Windows laptop or a Remote Desktop license.