diff --git a/Stardrop/Program.cs b/Stardrop/Program.cs
index b02fffe..f2d0b5a 100644
--- a/Stardrop/Program.cs
+++ b/Stardrop/Program.cs
@@ -147,9 +147,10 @@ public static void Main(string[] args)
                     settings.NexusDetails = new NexusUser();
                 }
 
-                // Delete any files underneath the Nexus folder
+                // Delete the downloaded archives underneath the Nexus folder once they are a week old. They are kept
+                // after installing so that mods like ModSyncCheck can collect them, which moves them out of the folder
                 var nexusDirectory = new DirectoryInfo(Pathing.GetNexusPath());
-                foreach (FileInfo file in nexusDirectory.GetFiles())
+                foreach (FileInfo file in nexusDirectory.GetFiles().Where(f => f.LastWriteTime < DateTime.Now.AddDays(-7)))
                 {
                     file.Delete();
                 }
diff --git a/Stardrop/Utilities/External/NexusClient.cs b/Stardrop/Utilities/External/NexusClient.cs
index beffcd3..bc6e1f9 100644
--- a/Stardrop/Utilities/External/NexusClient.cs
+++ b/Stardrop/Utilities/External/NexusClient.cs
@@ -470,8 +470,9 @@ public async Task<NexusDownloadResult> DownloadFileAndGetPath(string uri, string
             // usable as a filename is on the way into the path rather than at any one of them
             var filePath = Path.Combine(Pathing.GetNexusPath(), Pathing.GetSafePathSegment(fileName));
 
-            // FileMode.CreateNew throws on a name that is already taken, which would otherwise send a download that
-            // never started down the cleanup path below and delete whatever already held the name
+            // Archives are kept after installing, so an archive from an earlier download can already hold the name.
+            // It is overwritten via FileMode.Create, and only once the response has succeeded, so a download that
+            // never started leaves the earlier archive alone
             bool hasCreatedFile = false;
             try
             {
@@ -483,7 +484,7 @@ public async Task<NexusDownloadResult> DownloadFileAndGetPath(string uri, string
                     return new(DownloadResultKind.Failed, null);
                 }
 
-                using var fileStream = new FileStream(filePath, FileMode.CreateNew);
+                using var fileStream = new FileStream(filePath, FileMode.Create);
                 hasCreatedFile = true;
 
                 using var downloadStream = await response.Content.ReadAsStreamAsync();
diff --git a/Stardrop/Views/MainWindow.axaml.cs b/Stardrop/Views/MainWindow.axaml.cs
index 55f6592..4517425 100644
--- a/Stardrop/Views/MainWindow.axaml.cs
+++ b/Stardrop/Views/MainWindow.axaml.cs
@@ -1161,11 +1161,7 @@ private async void InstallButton_Click(object? sender, Avalonia.Interactivity.Ro
             await CheckForModUpdates(addedMods, useCache: true, skipCacheCheck: true);
             await GetCachedModUpdates(_viewModel.Mods.ToList(), skipCacheCheck: true);
 
-            // Delete the downloaded archived mod
-            if (File.Exists(downloadedFilePath))
-            {
-                File.Delete(downloadedFilePath);
-            }
+            // The downloaded archive is kept in the Nexus folder to be deleted later
 
             _viewModel.EvaluateRequirements();
             _viewModel.UpdateEndorsements();
@@ -2089,11 +2085,7 @@ private async Task HandleBulkModInstall(bool enabledModsOnly = false)
             await CheckForModUpdates(addedMods, useCache: true, skipCacheCheck: true);
             await GetCachedModUpdates(_viewModel.Mods.ToList(), skipCacheCheck: true);
 
-            // Delete the downloaded archived mods
-            foreach (var filePath in updateFilePaths.Where(p => File.Exists(p)))
-            {
-                File.Delete(filePath);
-            }
+            // The downloaded archives are kept in the Nexus folder to be deleted later
 
             _viewModel.EvaluateRequirements();
             _viewModel.UpdateEndorsements();
@@ -2271,11 +2263,7 @@ internal async Task<NXMLinkResult> ProcessNXMLink(NXM nxmLink)
                 await CheckForModUpdates(addedMods, useCache: true, skipCacheCheck: true);
                 await GetCachedModUpdates(_viewModel.Mods.ToList(), skipCacheCheck: true);
 
-                // Delete the downloaded archived mod
-                if (File.Exists(downloadedFilePath))
-                {
-                    File.Delete(downloadedFilePath);
-                }
+                // The downloaded archive is kept in the Nexus folder to be deleted later
 
                 _viewModel.EvaluateRequirements();
                 _viewModel.UpdateEndorsements();