Powershell MSI Installer/Updater

Hi, if somebody needs a Powershell MSI Installer/Updater. Have fun.

Import-Module -Name 'Carbon.Windows.Installer'

$app = 'SwyxIt!'
$installerPath = '...\SwyxIt!German64.msi'

#1
$package = try {Get-Package -Name $app -ErrorAction Stop} catch {$false}

#2
$localVersion = if ($package -ne $false) {$package.Version}

#3
$isInstalled = if (-not($package -eq $false)) {$true} else {$false}

#4
$installerVersion = (Get-CMsi -Path $installerPath).ProductVersion

#5
$otherVersion = $localVersion -ne $installerVersion

$msi = 'msiexec.exe'

$msiArray = @(
    "/i $installerPath"
    "/qb+"
    "ADDLOCAL="
        @(
            "PhoneClient"
            "FaxClient"
            "DesktopShortcut"
            "DesktopShortcutFaxClient"
            "StartupShortcut"
            "OfficeUCSupport"
            "Outlook2007Support"
            "ClientMeeting"
            "CLMgrTSP"
            "Video"
            "SwyxMeeting"
            "FAnalytics"
            "MsTeamsIntegration"
            "MsTeamsIntegrationSettings"
    )
)

$a1 = $msiArray[0..2]
$a2 = $msiArray[3..$msiArray.Length]

$msiArgs = "$a1" + "$a2".Replace(" ",",")

if ($isInstalled -and $otherVersion) {
    Write-Host "update app"
    Start-Process -FilePath $msi -ArgumentList $msiArgs -Wait
}
elseif ($isInstalled -and -not $otherVersion) {
    Write-Host 'app is up to date'
}
else {
    Write-Host "app is not installed"
}