diff --git a/Wabbajack.Common/Utils.cs b/Wabbajack.Common/Utils.cs
index 77ff661b..9b2034bc 100644
--- a/Wabbajack.Common/Utils.cs
+++ b/Wabbajack.Common/Utils.cs
@@ -147,13 +147,28 @@ namespace Wabbajack.Common
             return Convert.ToBase64String(data);
         }
 
-        public static string ToHEX(this byte[] bytes)
+        public static string ToHex(this byte[] bytes)
         {
             var builder = new StringBuilder();
             for (var i = 0; i < bytes.Length; i++) builder.Append(bytes[i].ToString("x2"));
             return builder.ToString();
         }
 
+        public static byte[] FromHex(this string hex)
+        {
+            return Enumerable.Range(0, hex.Length)
+                .Where(x => x % 2 == 0)
+                .Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
+                .ToArray();
+        }
+
+        public static DateTime AsUnixTime(this long timestamp)
+        {
+            System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
+            dtDateTime = dtDateTime.AddSeconds(timestamp).ToLocalTime();
+            return dtDateTime;
+        }
+
         /// <summary>
         ///     Returns data from a base64 stream
         /// </summary>
@@ -535,8 +550,8 @@ namespace Wabbajack.Common
 
         public static void CreatePatch(byte[] a, byte[] b, Stream output)
         {
-            var data_a = a.SHA256().FromBase64().ToHEX();
-            var data_b = b.SHA256().FromBase64().ToHEX();
+            var data_a = a.SHA256().FromBase64().ToHex();
+            var data_b = b.SHA256().FromBase64().ToHex();
             var cache_file = Path.Combine("patch_cache", $"{data_a}_{data_b}.patch");
             if (!Directory.Exists("patch_cache"))
                 Directory.CreateDirectory("patch_cache");
@@ -570,7 +585,7 @@ namespace Wabbajack.Common
         public static void TryGetPatch(string foundHash, string fileHash, out byte[] ePatch)
         {
             var patch_name = Path.Combine("patch_cache",
-                $"{foundHash.FromBase64().ToHEX()}_{fileHash.FromBase64().ToHEX()}.patch");
+                $"{foundHash.FromBase64().ToHex()}_{fileHash.FromBase64().ToHex()}.patch");
             ePatch = File.Exists(patch_name) ? File.ReadAllBytes(patch_name) : null;
         }
 
diff --git a/Wabbajack.Lib/Downloaders/NexusDownloader.cs b/Wabbajack.Lib/Downloaders/NexusDownloader.cs
index 8abc49e5..9498da77 100644
--- a/Wabbajack.Lib/Downloaders/NexusDownloader.cs
+++ b/Wabbajack.Lib/Downloaders/NexusDownloader.cs
@@ -6,6 +6,7 @@ using System.Threading.Tasks;
 using Wabbajack.Common;
 using Wabbajack.Lib.NexusApi;
 using Wabbajack.Lib.Validation;
+using Game = Wabbajack.Common.Game;
 
 namespace Wabbajack.Lib.Downloaders
 {
@@ -54,6 +55,8 @@ namespace Wabbajack.Lib.Downloaders
                 Utils.Error($"Automated installs with Wabbajack requires a premium nexus account. {client.Username} is not a premium account.");
                 return;
             }
+
+            var updated = client.GetModsUpdatedSince(Game.Skyrim,DateTime.Now - TimeSpan.FromDays(30));
         }
 
         public class State : AbstractDownloadState
diff --git a/Wabbajack.Lib/NexusApi/NexusApi.cs b/Wabbajack.Lib/NexusApi/NexusApi.cs
index e16c210c..44716889 100644
--- a/Wabbajack.Lib/NexusApi/NexusApi.cs
+++ b/Wabbajack.Lib/NexusApi/NexusApi.cs
@@ -197,7 +197,7 @@ namespace Wabbajack.Lib.NexusApi
 
         private T GetCached<T>(string url)
         {
-            var code = Encoding.UTF8.GetBytes(url).ToHEX();
+            var code = Encoding.UTF8.GetBytes(url).ToHex();
             var cache_file = Path.Combine(Consts.NexusCacheDirectory, code + ".json");
             if (File.Exists(cache_file) && DateTime.Now - File.GetLastWriteTime(cache_file) < Consts.NexusCacheExpiry)
             {
@@ -310,6 +310,40 @@ namespace Wabbajack.Lib.NexusApi
         {
             public string URI { get; set; }
         }
+
+        private class UpdatedMod
+        {
+            public long mod_id;
+            public long latest_file_update;
+            public long latest_mod_activity;
+        }
+
+        public IEnumerable<long> GetModsUpdatedSince(Game game, DateTime since)
+        {
+            var result =
+                Get<List<UpdatedMod>>(
+                    $"https://api.nexusmods.com/v1/games/{GameRegistry.Games[game].NexusName}/mods/updated.json?period=1m");
+            return result.Where(r => r.latest_file_update.AsUnixTime() >= since)
+                         .Select(m => m.mod_id)
+                         .ToList();
+        }
+
+        public static void ClearCacheFor(HashSet<(Game, long)> mods)
+        {
+            Directory.EnumerateFiles(Consts.NexusCacheDirectory, "*.json")
+                .PMap(f =>
+                {
+                    Utils.Status("Cleaning Nexus cache for");
+                    var filename = Encoding.UTF8.GetString(Path.GetFileNameWithoutExtension(f).FromHex());
+                    foreach (var (game, modid) in mods)
+                    {
+                        if (filename.Contains(GameRegistry.Games[game].NexusName) && 
+                            (filename.Contains("\\" + modid + "\\") ||
+                             filename.Contains("\\" + modid + ".")))
+                            File.Delete(f);
+                    }
+                });
+        }
     }
 
 }
\ No newline at end of file
diff --git a/Wabbajack.Lib/ReportBuilder.cs b/Wabbajack.Lib/ReportBuilder.cs
index c6d09198..a87b1f3e 100644
--- a/Wabbajack.Lib/ReportBuilder.cs
+++ b/Wabbajack.Lib/ReportBuilder.cs
@@ -61,7 +61,7 @@ namespace Wabbajack.Lib
                 $"#### Download Summary ({lst.Archives.Count} archives - {lst.Archives.Sum(a => a.Size).ToFileSizeString()})");
             foreach (var archive in SortArchives(lst.Archives))
             {
-                var hash = archive.Hash.FromBase64().ToHEX();
+                var hash = archive.Hash.FromBase64().ToHex();
                 NoWrapText(archive.State.GetReportEntry(archive));
                 NoWrapText($"    * Size : {archive.Size.ToFileSizeString()}");
                 NoWrapText($"    * SHA256 : [{hash}](https://www.virustotal.com/gui/file/{hash})");