Detect if VisioPS is installed

Detect if Visio PowerShell is installed

Get-Module -ListAvailable -Name Visio  | Select Path

If it is installed it will show you exactly where. In the example below you can see it is installed for a specific user.

Path
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C:\Users\saveenr\Documents\WindowsPowerShell\Modules\Visio\2.0.0\Visio.psd1