diff --git a/src/ClaudeDo.Installer/Core/ReleaseClient.cs b/src/ClaudeDo.Installer/Core/ReleaseClient.cs
index 4489ea5..78550dd 100644
--- a/src/ClaudeDo.Installer/Core/ReleaseClient.cs
+++ b/src/ClaudeDo.Installer/Core/ReleaseClient.cs
@@ -27,7 +27,7 @@ public sealed class ReleaseClient : IReleaseClient
             return ParseRelease(json);
         }
         catch (HttpRequestException) { return null; }
-        catch (TaskCanceledException) { return null; }
+        catch (TaskCanceledException) when (!ct.IsCancellationRequested) { return null; }
     }
 
     public async Task DownloadAsync(string url, string destPath, IProgress<long> progress, CancellationToken ct)
@@ -65,8 +65,11 @@ public sealed class ReleaseClient : IReleaseClient
             {
                 foreach (var item in arr.EnumerateArray())
                 {
-                    var aName = item.GetProperty("name").GetString() ?? "";
-                    var aUrl = item.GetProperty("browser_download_url").GetString() ?? "";
+                    if (!item.TryGetProperty("name", out var nameField)) continue;
+                    if (!item.TryGetProperty("browser_download_url", out var urlField)) continue;
+
+                    var aName = nameField.GetString() ?? "";
+                    var aUrl = urlField.GetString() ?? "";
                     var aSize = item.TryGetProperty("size", out var s) ? s.GetInt64() : 0L;
                     assets.Add(new ReleaseAsset(aName, aUrl, aSize));
                 }