Cannot install PnP.Powershell

Hi akkers,

The old API v2 URL is deprecated. Microsoft moved to https://www.powershellgallery.com/api/v3.

You could try the following:

Unregister the old PSGallery:
Unregister-PSRepository -Name "PSGallery"

Register the new one (v3):
Register-PSRepository -Name "PSGallery" `
                      -SourceLocation "https://www.powershellgallery.com/api/v3" `
                      -InstallationPolicy Trusted

Verify it's updated:
Get-PSRepository

Try installing the module again:
Install-Module -Name PnP.PowerShell

Also check the TLS. (Some systems may not default to TLS 1.2, which is required)
Run below code before installing the module.
This will only affect your current Powershell session, so it wont change it permanently.

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12