When upgrading SLM the snow services need to be stopped, if there is a monitoring tool or an issue shutting down the services it will cause the upgrade to fail.

The below script has multiple options, you can either just shut down the services or shut down the services and change the Startup Type to Disabled.  Once the upgrade is complete you can run the script again to revert the change and set the Snow services to Automatic.

N.B. You may need repeat the process if some of the services have not stopped.

###
# Description:  
# Stop / Start All Snow Services and change startup to Automatic / Disabled uncomment as required
# 
# Version: 1.0
# Updated: 20231113
# Author: Julian Dalley
###

##RUN IN POWERSHELL ISE WITH ADMIN RIGHTS##

#Stopping & starting services#####
# Uncomment one of the following lines based on the desired action
Stop-ServicesBeginningWithSnow
#Start-ServicesBeginningWithSnow

#Change the startup type#####
# Uncomment one of the following lines based on the desired action``
Set-ServicesToDisabled
#Set-ServicesToAutomatic

# Make sure to use the elevated permissions
if (!([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
    Start-Process powershell.exe "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`"" -Verb RunAs; exit 
}

function Set-ServicesToDisabled {
    # Get all services with names starting with 'Snow'
    $services = Get-Service | Where-Object { $_.DisplayName -match 'Snow' }

    # Set each service to disabled
    foreach ($service in $services) {
        Set-Service -Name $service.ServiceName -StartupType Disabled
        Write-Host "Service $($service.DisplayName) set to Disabled."
    }
}

function Set-ServicesToAutomatic {
    # Get all services with names starting with 'Snow'
    $services = Get-Service | Where-Object { $_.DisplayName -match 'Snow' }

    # Set each service to automatic
    foreach ($service in $services) {
        Set-Service -Name $service.ServiceName -StartupType Automatic
        Write-Host "Service $($service.DisplayName) set to Automatic."
    }
}

function Stop-ServicesBeginningWithSnow {

    # Get all services with names starting with 'Snow'
    $services = Get-Service | Where-Object { $_.DisplayName -match 'Snow' }

    # Stop each service
    foreach ($service in $services) {
        Stop-Service -Name $service.ServiceName -Force -WarningAction SilentlyContinue
        Write-Host "Service $($service.DisplayName) stopped."
    }
}

function Stop-ServicesBeginningWithSnow {

    # Get all services with names starting with 'Snow'
    $services = Get-Service | Where-Object { $_.DisplayName -match 'Snow' }

    # Stop each service
    foreach ($service in $services) {
        Stop-Service -Name $service.ServiceName -Force
        Write-Host "Service $($service.DisplayName) stopped."
    }
}

#Function to stop pending service
function Stop-ServicesWithStopPending {
    $Services = Get-WmiObject -Class win32_service -Filter "state = 'stop pending'"
    
    if ($Services) {
        foreach ($service in $Services) {
            try {
                Stop-Process -Id $service.processid -Force -PassThru -ErrorAction Stop
            }
            catch {
                Write-Warning -Message "Unexpected Error. Error details: $_.Exception.Message"
            }
        }
    }
    else {
        Write-Output "There are currently no services with a status of 'Stopping'."
    }
}

# Call the function
Stop-ServicesWithStopPending

function Start-ServicesBeginningWithSnow {
    # Get all services with names starting with 'Snow'
    $services = Get-Service | Where-Object { $_.DisplayName -match 'Snow' }

    # Start each service
    foreach ($service in $services) {
        Start-Service -Name $service.ServiceName
        Write-Host "Service $($service.DisplayName) started."
    }
}

# Reporting current service status with color-coded output

Write-Host -ForegroundColor Magenta "Reporting current service status"

# Get services with names starting with "Snow"
$services = Get-Service -Name "Snow*"

# Display service status and startup type with color-coded output
foreach ($service in $services) {
    $statusColor = switch ($service.Status) {
        'Running' { 'Green' }
        'Stopped' { 'Red' }
        'Stopping' { 'DarkYellow' }  # Using DarkYellow for orange-like color
        default { 'White' }  # You can adjust the default color as needed
    }

    $startupTypeColor = if ($service.StartType -eq 'Automatic') { 'Cyan' } else { 'White' }

    Write-Host -ForegroundColor $statusColor -NoNewline "$($service.DisplayName) is $($service.Status) with startup type "
    Write-Host -ForegroundColor $startupTypeColor "$($service.StartType)"

 }

  Write-Host -ForegroundColor Yellow "If all services are not stopped / started run again"