Changed sm script to take param

DownloadSM.ps1

@@ -1,4 +1,6 @@
-function Download-AgentMsi
+param ([string] $msiPath)
+
+function Download-AgentMsi
 {
 	param (
 		[string] $msiPath
@@ -15,7 +17,4 @@
 	Write-Host "End - Agent MSI download process."
 }
 
-$agentMsi = "ApplicationInsightsAgent.msi"
-$msiPath = Join-Path "C:\" $agentMsi
-
 Download-AgentMsi $msiPath