#Requires -Version 5.1
<#
    JbTecWiz Support Centre -- generated fix script

    Fault : Office is stuck on an old build, or a bad update needs rolling back
    Fix   : Find out why updates are not applying
    Source: https://jbtecwiz.com/support/win-office-update-channel

    Run as     : PowerShell as administrator
    Expect     : 30 minutes
    Risk       : low
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    Update Now does nothing, or the version never changes.

    HOW TO UNDO IT
    Set UpdatesEnabled back to False if it was deliberately off and you were
    only testing.

    This script walks the fix one step at a time and asks before each
    one. Steps with no command are things you do yourself -- it prints
    those and waits. Run with -DryRun to print without executing.
#>

[CmdletBinding()]
param(
    # Print every step and command without running anything.
    [switch]$DryRun,
    # Do not ask before each step. Read the script first if you use this.
    [switch]$Unattended
)

$ErrorActionPreference = 'Stop'
$script:Failed = 0

# This fix is documented as needing an elevated session.
$id = [Security.Principal.WindowsIdentity]::GetCurrent()
if (-not (New-Object Security.Principal.WindowsPrincipal $id).IsInRole(
        [Security.Principal.WindowsBuiltInRole]::Administrator)) {
    Write-Host ''
    Write-Host '  This fix needs an elevated PowerShell.' -ForegroundColor Yellow
    Write-Host '  Close this window, right-click PowerShell, Run as administrator,'
    Write-Host '  and run the script again.'
    Write-Host ''
    exit 3
}

function Write-Rule { param([string]$Text)
    Write-Host ''
    Write-Host ('-' * 70) -ForegroundColor DarkGray
    if ($Text) { Write-Host $Text -ForegroundColor Cyan }
}

function Show-Prose { param([string]$Text, [string]$Colour = "Gray")
    if (-not $Text) { return }
    $words = $Text -split "\s+"; $line = "  "
    foreach ($w in $words) {
        if (($line.Length + $w.Length) -gt 74) { Write-Host $line -ForegroundColor $Colour; $line = "  " }
        $line += "$w "
    }
    if ($line.Trim()) { Write-Host $line -ForegroundColor $Colour }
}

function Invoke-Step {
    param(
        [int]$Number, [string]$Do, [string]$Why,
        [scriptblock]$Command, [switch]$Manual, [string]$Shell = "powershell"
    )
    Write-Rule "  Step $Number of 5"
    Show-Prose $Do "White"
    if ($Why) { Write-Host ""; Show-Prose $Why "DarkGray" }

    if ($Manual) {
        Write-Host ''
        Write-Host '  -> Do this yourself, then press Enter to carry on.' -ForegroundColor Yellow
        if (-not $Unattended -and -not $DryRun) { [void](Read-Host) }
        return
    }

    Write-Host ''
    foreach ($l in ($Command.ToString().Trim() -split "`n")) {
        Write-Host ("    " + $l.Trim()) -ForegroundColor Green
    }
    Write-Host ''

    if ($DryRun) { Write-Host "  (dry run -- not executed)" -ForegroundColor DarkGray; return }
    if (-not $Unattended) {
        $a = Read-Host "  Run this step? [Y]es / [S]kip / [Q]uit"
        if ($a -match "^[Qq]") { Write-Host "  Stopped at your request."; exit 0 }
        if ($a -match "^[Ss]") { Write-Host "  Skipped." -ForegroundColor DarkGray; return }
    }
    try { & $Command }
    catch {
        $script:Failed++
        Write-Host ("  Step $Number failed: " + $_.Exception.Message) -ForegroundColor Red
        Show-Prose "The rest of the fix may depend on this. Read the write-up before carrying on." "Red"
        if (-not $Unattended) {
            $c = Read-Host "  Carry on anyway? [y/N]"
            if ($c -notmatch "^[Yy]") { exit 1 }
        }
    }
}

Write-Rule
Write-Host '  Office is stuck on an old build, or a bad update needs rolling back' -ForegroundColor White
Write-Host '  Find out why updates are not applying' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: low   Reversible   30 minutes'
Write-Rule

if (-not $Unattended -and -not $DryRun) {
    $go = Read-Host '  Ready? [y/N]'
    if ($go -notmatch "^[Yy]") { Write-Host "  Nothing was changed."; exit 0 }
}

Invoke-Step -Number 1 -Do 'Read the current state -- version, channel, and whether updates are permitted at all.' -Why 'UpdatesEnabled set to False is the answer surprisingly often, left behind by a deployment configuration or a well-meaning attempt to stop updates during a project.' -Command {
    Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Office\ClickToRun\Configuration' | Format-List ClientVersionToReport, UpdateChannel, UpdatesEnabled, CDNBaseUrl
}

Invoke-Step -Number 2 -Do 'Re-enable updates if they are turned off.' -Command {
    Set-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Office\ClickToRun\Configuration' -Name UpdatesEnabled -Value 'True'
}

Invoke-Step -Number 3 -Do 'Check for a policy that overrides the local setting.' -Command {
    Get-ItemProperty 'HKLM:\SOFTWARE\Policies\Microsoft\Office\16.0\Common\OfficeUpdate' -ErrorAction SilentlyContinue
}

Invoke-Step -Number 4 -Do 'Confirm the scheduled task that drives updates exists and is running.' -Command {
    Get-ScheduledTask -TaskPath '\Microsoft\Office\' -ErrorAction SilentlyContinue | Select-Object TaskName, State
}

Invoke-Step -Number 5 -Do 'Force an update from the command line, which reports errors the button swallows.' -Command {
    & "$env:CommonProgramFiles\Microsoft Shared\ClickToRun\OfficeC2RClient.exe" /update user displaylevel=true forceappshutdown=true
}

Write-Rule "  Confirm it worked"
Show-Prose 'The version reported changes and matches the current build for the channel.' 'White'
Write-Host ''
if (-not $DryRun) {
    Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Office\ClickToRun\Configuration' | Select-Object ClientVersionToReport
}

Write-Rule
if ($script:Failed -gt 0) {
    Write-Host ("  Finished with " + $script:Failed + " failed step(s).") -ForegroundColor Yellow
    Show-Prose 'Read the full write-up at https://jbtecwiz.com/support/win-office-update-channel' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Set UpdatesEnabled back to False if it was deliberately off and you were only testing.' 'DarkGray'
Write-Rule