Deployment via Powershell

We are in an environment where users don't attend site regular. We have opted to use our RMM software (Atera) to deploy a script out remotely to users who have just a internet connection. However it seems that the script is having issues deploying down the program to run. Sophos have recommended we post it here for assistance as I am a bit lost on where to go here , not knowing powershell at all.

###
# Author: Dave Long <dlong@cagedata.com>
# Downloads and installs Sophos
###

###
# Update the below variables to match your setup
$SophosUrl = "Our link to the install via our Sophos Central Endpoint"
$AteraAPIKey = "Obtained and Confirmed Correct API Key"

$SophosTokenCustomValueName = "346cd89ee3e290a6cf997ab28b08a794"
$InstalledProducts = "all" # Can be "all" or a comma-separated list including any of the following: antivirus, intercept, mdr, deviceEncryption, uem
###

if ($null -eq (Get-Module -ListAvailable PSAtera)) {
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
Install-Module -Name PSAtera -Force
}

Set-AteraAPIKey -APIKey $AteraAPIKey

$Agent = Get-AteraAgent
$SophosToken = Get-AteraCustomValue -ObjectType Customer -ObjectID $Agent.customerID -FieldName "Sophos Token"

if ($SophosToken.ValueAsString -eq "") {
Write-Error "Sophos Token not defined on Customer Record."
exit
}

$SophosInstaller = Join-Path -Path $env:TEMP -ChildPath "SophosSetup.exe"

Invoke-WebRequest -Uri $SophosUrl -OutFile $SophosInstaller

& $sophosInstaller --customertoken="$($SophosToken.ValueAsString)" --epinstallerserver="api-cloudstation-us-east-2.prod.hydra.sophos.com" --products="all" --quiet

do {
Get-Process -Name "*SophosSetup.exe*"
Start-Sleep -Seconds 10
} while (Get-Process -Name "*SophosSetup.exe*" -ErrorAction SilentlyContinue)

Get-Service -Name "*Sophos*"

The error we get is below: 

Begining the installation
c:\temp\ already exists
Start-Process : This command cannot be run due to the error: The system cannot find the file specified.
At C:\Program Files\ATERA 
Networks\AteraAgent\Packages\AgentPackageSystemTools\96e455eb-e599-4cdd-8745-8d5780e89485_Sophos Intercept X Installer 
(copy).ps1:47 char:1
+ Start-Process -FilePath "C:\Program Files\Sophos\Sophos UI\Sophos UI. ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Start-Process], InvalidOperationException
    + FullyQualifiedErrorId : InvalidOperationException,Microsoft.PowerShell.Commands.StartProcessCommand