log messages to log file instead of output stream

Start-Windows10UpdateAssistant.ps1

@@ -13,34 +13,34 @@ If ( IsWindowsVersion -ge "10.0" ) {
         ## Uninstall previous Windows 10 Update Assistant
         If ( Test-Path "${Env:SystemDrive}\Windows10Upgrade\Windows10UpgraderApp.exe" )
         {
-            Write-Output "Uninstalling existing Windows 10 Update Assistant"
+            LogMsg "Uninstalling existing Windows 10 Update Assistant"
             Try { Start-Process "${Env:SystemDrive}\Windows10Upgrade\Windows10UpgraderApp.exe" -ArgumentList '/ForceUninstall' -Wait }
-            Catch { Write-Output $_.Exception.Message }
+            Catch { LogMsg $_.Exception.Message }
         }
 
         ## Download Windows 10 Update Assistant
         $FILENAME = Split-Path $URL -leaf
         If ( Test-Path "${DOWNLOADS}\${FILENAME}" )
         {
-            Write-Output "Deleting existing installer: ${DOWNLOADS}\${FILENAME}"
+            LogMsg "Deleting existing installer: ${DOWNLOADS}\${FILENAME}"
             Try { Remove-Item "${DOWNLOADS}\${FILENAME}" -Force -ErrorAction SilentlyContinue }
-            Catch { Write-Output $_.Exception.Message }
+            Catch { LogMsg $_.Exception.Message }
         }
-        Write-Output "Downloading ${URL} to ${DOWNLOADS}\${FILENAME}"
+        LogMsg "Downloading ${URL} to ${DOWNLOADS}\${FILENAME}"
         Try { (New-Object System.Net.WebClient).DownloadFile($URL,"${DOWNLOADS}\${FILENAME}") }
-        Catch { Write-Output $_.Exception.Message }
+        Catch { LogMsg $_.Exception.Message }
 
         ## Install and run the Windows 10 Update Assistant
         If ( Test-Path "${DOWNLOADS}\${FILENAME}" )
         {
-            Write-Output "Launching installer: ${DOWNLOADS}\${FILENAME}"
+            LogMsg "Launching installer: ${DOWNLOADS}\${FILENAME}"
             Try { Start-Process -FilePath "${DOWNLOADS}\${FILENAME}" }
-            Catch { Write-Output $_.Exception.Message }
+            Catch { LogMsg $_.Exception.Message }
         }
-        Else { Write-Output "${DOWNLOADS}\${FILENAME} does not exist" }
+        Else { LogMsg "${DOWNLOADS}\${FILENAME} does not exist" }
 
     }
-    Else { Write-Output "This endpoint is already up to date." }
+    Else { LogMsg "This endpoint is already up to date." }
 
 }
-Else { Write-Output "This endpoint is not running Windows 10." }
+Else { LogMsg "This endpoint is not running Windows 10." }