Update download.4dm

Documentation/download.4dm

@@ -1,11 +1,17 @@
+
 var $url : Text
 $url:="https://github.com/4d/4D-Mobile-App/releases/latest/download/4D.Mobile.App.4dbase.zip"
 
+If (Folder(fk database folder).folder("Components").folder("4D Mobile App.4dbase").exists)
+	ALERT("Please close 4D and remove the component (and restart 4D)")
+	SHOW ON DISK(Folder(fk database folder).folder("Components").folder("4D Mobile App.4dbase").platformPath)
+	return 
+End if 
 var $response : Object
 $response:=4D.HTTPRequest.new($url).wait().response
 
 If ($response.status=200)
-	
+
 	var $archiveFile : 4D.File
 	$archiveFile:=Folder(fk database folder).folder("Components").file("4D.Mobile.App.4dbase.zip")
 	$archiveFile.setContent($response.body)
@@ -20,10 +26,11 @@ If ($response.status=200)
 	$archiveFolder.copyTo(Folder(fk database folder).folder("Components"); "4D Mobile App.4dbase")
 	$archive:=Null
 	$archiveFolder:=Null
-	
+
 	$archiveFile.delete()
-	
+
 	RESTART 4D
+
 Else 
 	ALERT("Cannot download from latest release")
-End if 
+End if