DeleteOldDownloads.linq

<Query Kind="Statements">
  <Reference>&lt;RuntimeDirectory&gt;\System.Dynamic.dll</Reference>
  <Reference>&lt;RuntimeDirectory&gt;\System.Dynamic.Runtime.dll</Reference>
  <Namespace>System</Namespace>
  <Namespace>System.Collections</Namespace>
  <Namespace>System.Collections.Generic</Namespace>
</Query>

var sourceDir = @"D:\Downloads\All Shows\The Big Bang Theory";

var files = Directory.GetFiles(sourceDir,"*",SearchOption.AllDirectories);

foreach (var file in files)
{
	var createdOn = File.GetCreationTime(file);
	
	if (createdOn < DateTime.Now.AddMonths(-10))
	{
		$"deleting {file}".Dump();
		File.Delete(file);
	}
}