winutil/functions/private/Invoke-WinUtilInstallPSProfile.ps1

function Invoke-WinUtilInstallPSProfile {
    <#
    .SYNOPSIS
        Backs up your original profile then installs and applies the CTT PowerShell profile.
    #>

    Invoke-WPFRunspace -ArgumentList $PROFILE -DebugPreference $DebugPreference -ScriptBlock {
        # Remap the automatic built-in $PROFILE variable to the parameter named $PSProfile.
        param ($PSProfile)

        function Invoke-PSSetup {
            # Define the URL used to download Chris Titus Tech's PowerShell profile.
            $url = "https://raw.githubusercontent.com/ChrisTitusTech/powershell-profile/main/Microsoft.PowerShell_profile.ps1"

            # Get the file hash for the user's current PowerShell profile.
            $OldHash = Get-FileHash $PSProfile -ErrorAction SilentlyContinue

            # Download Chris Titus Tech's PowerShell profile to the 'TEMP' folder.
            Invoke-RestMethod $url -OutFile "$env:TEMP/Microsoft.PowerShell_profile.ps1"

            # Get the file hash for Chris Titus Tech's PowerShell profile.
            $NewHash = Get-FileHash "$env:TEMP/Microsoft.PowerShell_profile.ps1"

            # Store the file hash of Chris Titus Tech's PowerShell profile.
            if (!(Test-Path "$PSProfile.hash")) {
                $NewHash.Hash | Out-File "$PSProfile.hash"
            }

            # Check if the new profile's hash doesn't match the old profile's hash.
            if ($NewHash.Hash -ne $OldHash.Hash) {
                # Check if oldprofile.ps1 exists and use it as a profile backup source.
                if (Test-Path "$env:USERPROFILE\oldprofile.ps1") {
                    Write-Host "===> Backup File Exists... <===" -ForegroundColor Yellow
                    Write-Host "===> Moving Backup File... <===" -ForegroundColor Yellow
                    Copy-Item "$env:USERPROFILE\oldprofile.ps1" "$PSProfile.bak"
                    Write-Host "===> Profile Backup: Done. <===" -ForegroundColor Yellow
                } else {
                    # If oldprofile.ps1 does not exist use $PSProfile as a profile backup source.
                    # Check if the profile backup file has not already been created on the disk.
                    if ((Test-Path $PSProfile) -and (-not (Test-Path "$PSProfile.bak"))) {
                        # Let the user know their PowerShell profile is being backed up.
                        Write-Host "===> Backing Up Profile... <===" -ForegroundColor Yellow

                        # Copy the user's current PowerShell profile to the backup file path.
                        Copy-Item -Path $PSProfile -Destination "$PSProfile.bak"

                        # Let the user know the profile backup has been completed successfully.
                        Write-Host "===> Profile Backup: Done. <===" -ForegroundColor Yellow
                    }
                }

                # Let the user know Chris Titus Tech's PowerShell profile is being installed.
                Write-Host "===> Installing Profile... <===" -ForegroundColor Yellow

                # Start a new hidden PowerShell instance because setup.ps1 does not work in runspaces.
                Start-Process -FilePath "pwsh" -ArgumentList "-ExecutionPolicy Bypass -NoProfile -Command `"Invoke-Expression (Invoke-WebRequest `'https://github.com/ChrisTitusTech/powershell-profile/raw/main/setup.ps1`')`"" -WindowStyle Hidden -Wait

                # Let the user know Chris Titus Tech's PowerShell profile has been installed successfully.
                Write-Host "Profile has been installed. Please restart your shell to reflect the changes!" -ForegroundColor Magenta

                # Let the user know Chris Titus Tech's PowerShell profile has been setup successfully.
                Write-Host "===> Finished Profile Setup <===" -ForegroundColor Yellow
            } else {
                # Let the user know Chris Titus Tech's PowerShell profile is already fully up-to-date.
                Write-Host "Profile is up to date" -ForegroundColor Magenta
            }
        }

        # Check if PowerShell Core is currently installed as a program and is available as a command.
        if (Get-Command "pwsh" -ErrorAction SilentlyContinue) {
            # Check if the version of PowerShell Core currently in use is version 7 or higher.
            if ($PSVersionTable.PSVersion.Major -ge 7) {
                # Invoke the PowerShell Profile setup script to install Chris Titus Tech's PowerShell Profile.
                Invoke-PSSetup
            } else {
                # Let the user know that PowerShell 7 is installed but is not currently in use.
                Write-Host "This profile requires Powershell 7, which is currently installed but not used!" -ForegroundColor Red

                # Load the necessary .NET library required to use Windows Forms to show dialog boxes.
                Add-Type -AssemblyName System.Windows.Forms

                # Display the message box asking if the user wants to install PowerShell 7 or not.
                $question = [System.Windows.Forms.MessageBox]::Show(
                    "Profile requires Powershell 7, which is currently installed but not used! Do you want to install the profile for Powershell 7?",
                    "Question",
                    [System.Windows.Forms.MessageBoxButtons]::YesNo,
                    [System.Windows.Forms.MessageBoxIcon]::Question
                )

                # Proceed with the installation and setup of the profile as the user pressed the 'Yes' button.
                if ($question -eq [System.Windows.Forms.DialogResult]::Yes) {
                    Invoke-PSSetup
                } else {
                    # Let the user know the setup of the profile will not proceed as they pressed the 'No' button.
                    Write-Host "Not proceeding with the profile setup!" -ForegroundColor Magenta
                }
            }
        } else {
            # Let the user know that the profile requires PowerShell Core but it is not currently installed.
            Write-Host "This profile requires Powershell Core, which is currently not installed!" -ForegroundColor Red
        }
    }
}