improved agent installation detection

Install-ManagementAgent.ps1

@@ -1,4 +1,4 @@
-[CmdletBinding()]
+#[CmdletBinding()]
 param(
     [string]$TOKEN,
     [int]$CUSTOMER_ID,
@@ -7,6 +7,11 @@ param(
     [string]$AGENT_FILENAME='EmberkomAgentSetup.exe'
 )
 
+## Immediately delete this script from disk
+$THIS_SCRIPT = $MyInvocation.InvocationName
+Try { Remove-Item $MyInvocation.InvocationName -Force }
+Catch { Write-Output "This script tried to delete itself but failed!" }
+
 ## Get temporary path
 $TEMP = [System.IO.Path]::GetTempPath()
 
@@ -19,13 +24,6 @@ Function Write-Log([string]$message)
     Add-Content -Path $LOGFILE -Value $entry
 }
 Write-Log "Agent installation script has started"
-
-## Immediately delete this script from disk
-$THIS_SCRIPT = $MyInvocation.InvocationName
-Write-Log "Deleting this script: ${THIS_SCRIPT}"
-Try { Remove-Item $MyInvocation.InvocationName -Force }
-Catch { Write-Log "This script tried to delete itself but failed!" }
-
 Write-Log "CUSTOMER_ID: ${CUSTOMER_ID}"
 Write-Log "SOFTWARE_ID: ${SOFTWARE_ID}"
 
@@ -36,11 +34,15 @@ Write-Log "Agent installer will be saved to: ${AGENT_INSTALLER}"
 ## Make sure the CUSTOMER_ID is specified
 If ( $CUSTOMER_ID -and $TOKEN )
 {
+    ## Get the right path to agent.exe based on the system bit-level
+    If ( Test-Path "${Env:ProgramFiles(x86)}" )
+    { $AGENT_EXE = "${Env:ProgramFiles(x86)}\N-able Technologies\Windows Agent\bin\agent.exe" }
+    Else { $AGENT_EXE = "${Env:ProgramFiles}\N-able Technologies\Windows Agent\bin\agent.exe" }
+
     ## Make sure we need to install the agent
-    If ( !(Test-Path 'HKLM:SOFTWARE\N-able Technologies\NcentralAsset') -and !(Test-Path 'SOFTWARE\Wow6432Node\N-able Technologies\NcentralAsset'))
+    If ( !(Test-Path $AGENT_EXE) )
     {
         ## Build the AGENT_URL
-        #$AGENT_URL = 'https://manage.emberkom.com/downloadAgentOrProbeSoftwareDownloadAction.action?customerId={0}&softwareId={1}' -f $CUSTOMER_ID.ToString(),$SOFTWARE_ID.ToString()
         $AGENT_URL = 'https://manage.emberkom.com/download/2020.1.0.202/winnt/N-central/WindowsAgentSetup.exe'
 
         ## Delete $AGENT_INSTALLER if it already exists