update error reporting

Install-ManagementAgent.ps1

@@ -26,7 +26,7 @@ If ( $CUSTOMER_ID )
         If ( Test-Path $AGENT_INSTALLER )
         {
             Try { Remove-Item $AGENT_INSTALLER -Force }
-            Catch { Write-Output "The agent installer already exists but there was an error when trying to delete it!" }
+            Catch { Write-Output $_.Exception.Message }
         }
 
         ## Download the agent installer
@@ -35,17 +35,17 @@ If ( $CUSTOMER_ID )
             [System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true}
             (New-Object System.Net.WebClient).DownloadFile($AGENT_URL, $AGENT_INSTALLER)
         }
-        Catch { Write-Output "There was an error downloading the agent installer!" }
+        Catch { Write-Output $_.Exception.Message ; Exit }
 
         ## Install the agent
         Try { Start-Process $AGENT_INSTALLER -ArgumentList '/quiet /passive' -Wait }
-        Catch { Write-Output "There was an error installing the agent!" }
+        Catch { Write-Output $_.Exception.Message }
 
         ## Remove the agent installer
         If ( Test-Path $AGENT_INSTALLER )
         {
             Try { Remove-Item -Path $AGENT_INSTALLER -Force }
-            Catch { Write-Output "There was an error while deleting the agent installer!" }
+            Catch { Write-Output $_.Exception.Message }
         }
     } Else { Write-Output "The agent is already installed on this endpoint." }
 } Else { Write-Output "No CUSTOMER_ID was specified!" }