1. 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.
2. 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).
3. Download the FuraCode Nerd Font from Nerd Fonts.
4. Install all the 'Fura Code xxx Nerd Font Complete.otf' fonts. Don't bother with the 'Fira *' fonts.
5. Follow these instructions or these instructions.
6. The theme you like was 'Paradox', but is now 'avit'.
7. Run Install-Module -Name Terminal-Icons -Repository PSGallery.

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