Find Most Recent Windows CU Installed

function Find-WindowsUpdateLastCUInstalled {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false)]
        [Switch]
        $ByHistory
    )

    begin {
        $OSVer = (Get-Item C:\Windows\System32\ntoskrnl.exe).VersionInfo.FileVersionRaw
        if ($OSVer.Major -ne 10 -or $OSVer.Minor -ne 0)
        { throw [System.NotSupportedException]::new("OS version must be 10.0.x.x") }
    }process {
        if ($ByHistory) {
            Write-PSFMessage -Level Warning -Message "This method is less reliable as uninstallations are not included in the history."

            $UpdateSession = (New-Object -ComObject 'Microsoft.Update.Session')
            $UpdateSearcher = $UpdateSession.CreateUpdateSearcher()
            $UpdateHistory = $UpdateSearcher.QueryHistory(0, $UpdateSearcher.GetTotalHistoryCount())
            $LastCU = $UpdateHistory | Where-Object {
                $_.Title -match "\d{4}-\d{2}\sCumulative Update for (?:Windows|Microsoft\sserver\soperating\ssystem)" -and $_.ResultCode -eq 2 } |
            Sort-Object Date -Descending | Select-Object -First 1
            if ($LastCU) {
                [void]($LastCU.Title -match "(?<Series>\d{4}-\d{2})\sCumulative Update for (?:Windows|Microsoft\sserver\soperating\ssystem)")
                $LastCU | Add-Member -NotePropertyName "Series" -NotePropertyValue ([DateTime]::Parse($Matches.Series)) -Force

                return $LastCU
            }
        }
        else {
            if (-not (Test-Path -Path "$PSScriptRoot\BuildTable.json")) {
                Write-PSFMessage -Level Error -Message "Please run 'Update-WindowsUpdateCUBuildTable' before running this command. Please note, you will need an Internet connection for this command."
                return
            }
            elseif (((Get-Date) - (Get-Item -Path "$PSScriptRoot\BuildTable.json").LastWriteTime).TotalDays -ge 30) {
                Write-PSFMessage -Level Warning -Message "It has been at least 30 days since the build table was last updated. It is recommended to run 'Update-WindowsUpdateCUBuildTable' (requires an Internet connection)."
            }

            try
            { $BuildTable = Get-Content -Path "$PSScriptRoot\BuildTable.json" -Raw | ConvertFrom-Json -ErrorAction Stop }
            catch
            { Write-PSFMessage -Level Critical -Message "The build table seems to be corrupted. Please run 'Update-WindowsUpdateCUBuildTable' (requires an Internet connection)."; return }

            if (-not ($BuildTable | Get-Member -MemberType NoteProperty -Name "Build"))
            { Write-PSFMessage -Level Critical -Message "The build table seems to be corrupted. Please run 'Update-WindowsUpdateCUBuildTable' (requires an Internet connection)."; return }

            return $BuildTable | Where-Object { $_.Build.Major -eq $OSVer.Major -and $_.Build.Minor -eq $OSVer.Minor -and $_.Build.Revision -eq $OSVer.Revision } | Select-Object -First 1
        }
    }
}

function Update-WindowsUpdateCUBuildTable {
    [CmdletBinding()]
    param ()

    begin {
        $WIN_MAJORMINOR = "10.0"
        $WIN_KB_URLS = @(
            "https://support.microsoft.com/en-us/help/5018682", # Windows 10, Server 2016, Server 2019
            "https://support.microsoft.com/en-us/help/5031682" # Windows 11
            "https://support.microsoft.com/en-us/help/5005454" # Server 2022
        )
        $NAVTAB_REGEX = "(?i)((?:(?:Jan|Feb|Mar|Apr|May|June|July|Aug|Sept|Oct|Nov|Dec)\.{0,1}|(?:January|February|March|April|May|June|July|August|September|October|November|December))\s+\d{1,2},\s+\d{4}).+(KB\d+){1}.+(?:OS Build(?:s){0,1}\s((?:\d+\.\d+).*))\)(?:\s(.+)<)*"

        $BuildTable = @()
    }process {
        $WIN_KB_URLS | ForEach-Object {
            try
            { $htmlSrc = Invoke-RestMethod -Uri $_ -UseBasicParsing -ErrorAction Stop }
            catch
            { Write-PSFMessage -Level Critical -Message $Error[0]; return }

            [Regex]::Matches($htmlSrc, $NAVTAB_REGEX) | ForEach-Object {
                $g = $_.Groups
                ($g[3] -replace "[^0-9. ]", "").Split(" ") | Where-Object { $_ } | ForEach-Object {
                    $BuildTable += [PSCustomObject]@{
                        KB         = $g[2].Value
                        DateStamp  = [DateTime]::Parse($g[1].Value)
                        Build      = [Version]"$WIN_MAJORMINOR.$_"
                        Descriptor = $g[4].Value
                    }
                }
            }
        }

        $BuildTable | ConvertTo-Json | Out-File -FilePath "$PSScriptRoot\BuildTable.json"
    }
}