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Powershell Setup

Run Get-PSRepository to verify if PowerShell Gallery is set up properly. If it isn't, you probably need to set up the web proxy settings.
Run Find-Module posh-git to verify that modules can be installed. If you get 'Unable to resolve package source…' you will need to install it manually (don't bother trying to fix it).
Run Install-Module posh-git -Scope CurrentUser.
Run Install-Module oh-my-posh -Scope CurrentUser.
The theme you like was 'Paradox', but is now 'avit'.
Run Install-Module -Name Terminal-Icons -Repository PSGallery.

Run code $profile. Update to:

Import-Module posh-git
Import-Module oh-my-posh
Set-PoshPrompt -Theme avit
Import-Module -Name Terminal-Icons
Write-Output "Powershell version $($PSVersionTable.PSVersion)"

setup, powershell