diff --git a/src/Agent/AutopilotMonitor.Agent.V2.Core.Tests/SignalAdapters/ImeLogTrackerAdapterTests.cs b/src/Agent/AutopilotMonitor.Agent.V2.Core.Tests/SignalAdapters/ImeLogTrackerAdapterTests.cs
index fc4891a6..f4b04e4e 100644
--- a/src/Agent/AutopilotMonitor.Agent.V2.Core.Tests/SignalAdapters/ImeLogTrackerAdapterTests.cs
+++ b/src/Agent/AutopilotMonitor.Agent.V2.Core.Tests/SignalAdapters/ImeLogTrackerAdapterTests.cs
@@ -621,5 +621,87 @@ namespace AutopilotMonitor.Agent.V2.Core.Tests.SignalAdapters
             Assert.Same(priorDo, f.Tracker.OnDoTelemetryReceived);
             Assert.Same(priorScript, f.Tracker.OnScriptCompleted);
         }
+
+        [Theory]
+        // V1 parity: terminal Installed/Error transitions must also emit a shadow
+        // `download_progress` event with status=completed/failed so the Web UI's
+        // DownloadProgress panel closes out apps that produced no byte progress
+        // (WinGet/Store apps emit no DO byte data — without the shadow they'd
+        // stay stuck on "started" forever).
+        [InlineData(AppInstallationState.Installed, SharedEventTypes.AppInstallComplete, "completed")]
+        [InlineData(AppInstallationState.Error, SharedEventTypes.AppInstallFailed, "failed")]
+        public void AppStateChange_terminal_state_emits_V1_parity_shadow_download_progress(
+            AppInstallationState terminalState,
+            string expectedPrimaryEventType,
+            string expectedShadowStatus)
+        {
+            using var f = new ImeLogTrackerAdapterFixture();
+            using var adapter = new ImeLogTrackerAdapter(f.Tracker, f.Ingress, f.Clock);
+            var app = AppPackageState.Restore(
+                id: "wg-app",
+                listPos: 0,
+                name: "Company Portal",
+                runAs: AppRunAs.System,
+                intent: AppIntent.Install,
+                targeted: AppTargeted.Device,
+                dependsOn: new HashSet<string>(),
+                installationState: terminalState,
+                downloadingOrInstallingSeen: true,
+                progressPercent: terminalState == AppInstallationState.Installed ? 100 : 0,
+                bytesDownloaded: terminalState == AppInstallationState.Installed ? 100 : 0,
+                bytesTotal: 100,
+                errorPatternId: null,
+                errorDetail: terminalState == AppInstallationState.Error ? "synthetic" : null,
+                errorCode: terminalState == AppInstallationState.Error ? "1" : null,
+                exitCode: null,
+                hresultFromWin32: null,
+                appType: "WinGet");
+
+            adapter.TriggerAppStateFromTest(app, AppInstallationState.Installing, terminalState);
+
+            // Primary terminal event still fires once (unchanged).
+            Assert.Single(f.InfoEvents(expectedPrimaryEventType));
+
+            // Shadow `download_progress` carries status + the same payload fields.
+            var shadow = Assert.Single(f.InfoEvents(SharedEventTypes.DownloadProgress));
+            Assert.Equal(expectedShadowStatus, shadow.Payload!["status"]);
+            Assert.Equal("wg-app", shadow.Payload["appId"]);
+            Assert.Equal("Company Portal", shadow.Payload["appName"]);
+            Assert.Equal(EventSeverity.Debug.ToString(), shadow.Payload[SignalPayloadKeys.Severity]);
+        }
+
+        [Fact]
+        public void AppStateChange_non_terminal_transitions_do_not_emit_shadow_download_progress()
+        {
+            using var f = new ImeLogTrackerAdapterFixture();
+            using var adapter = new ImeLogTrackerAdapter(f.Tracker, f.Ingress, f.Clock);
+            AppPackageState MakeApp(AppInstallationState state) => AppPackageState.Restore(
+                id: "app-1",
+                listPos: 0,
+                name: "App",
+                runAs: AppRunAs.System,
+                intent: AppIntent.Install,
+                targeted: AppTargeted.Device,
+                dependsOn: new HashSet<string>(),
+                installationState: state,
+                downloadingOrInstallingSeen: true,
+                progressPercent: 0,
+                bytesDownloaded: 0,
+                bytesTotal: 0,
+                errorPatternId: null,
+                errorDetail: null,
+                errorCode: null,
+                exitCode: null,
+                hresultFromWin32: null);
+
+            // Downloading → Installing must NOT add a shadow `download_progress` —
+            // and Skipped/Postponed terminal states must NOT either (V1 parity).
+            adapter.TriggerAppStateFromTest(MakeApp(AppInstallationState.Downloading), AppInstallationState.Unknown, AppInstallationState.Downloading);
+            adapter.TriggerAppStateFromTest(MakeApp(AppInstallationState.Installing), AppInstallationState.Downloading, AppInstallationState.Installing);
+            adapter.TriggerAppStateFromTest(MakeApp(AppInstallationState.Skipped), AppInstallationState.Installing, AppInstallationState.Skipped);
+            adapter.TriggerAppStateFromTest(MakeApp(AppInstallationState.Postponed), AppInstallationState.Installing, AppInstallationState.Postponed);
+
+            Assert.Empty(f.InfoEvents(SharedEventTypes.DownloadProgress));
+        }
     }
 }
diff --git a/src/Agent/AutopilotMonitor.Agent.V2.Core/SignalAdapters/ImeLogTrackerAdapter.cs b/src/Agent/AutopilotMonitor.Agent.V2.Core/SignalAdapters/ImeLogTrackerAdapter.cs
index 26621528..ef93f818 100644
--- a/src/Agent/AutopilotMonitor.Agent.V2.Core/SignalAdapters/ImeLogTrackerAdapter.cs
+++ b/src/Agent/AutopilotMonitor.Agent.V2.Core/SignalAdapters/ImeLogTrackerAdapter.cs
@@ -376,6 +376,7 @@ namespace AutopilotMonitor.Agent.V2.Core.SignalAdapters
             if (mapped == null) return;
 
             var (eventType, severity) = mapped.Value;
+            var payload = BuildAppStatePayload(app, newState, timing);
             // All app-state transitions flush immediately, including `download_progress`:
             // progress ticks run every 3s and only while a download is actively in flight
             // (bounded by download duration), so live UI responsiveness wins over the small
@@ -386,9 +387,31 @@ namespace AutopilotMonitor.Agent.V2.Core.SignalAdapters
                 message: BuildAppStateMessage(app, newState, eventType),
                 severity: severity,
                 immediateUpload: true,
-                data: BuildAppStatePayload(app, newState, timing),
+                data: payload,
                 occurredAtUtc: now);
 
+            // V1 parity: on terminal Installed/Error transitions, also emit a shadow
+            // `download_progress` event tagged with status=completed/failed. The Web UI's
+            // DownloadProgress panel relies on this to close out apps that never produced
+            // byte-level progress (WinGet/Store apps emit no `download_progress` ticks
+            // because they have no DO byte data). Without this, Company Portal & friends
+            // stay stuck on "started" forever.
+            if (newState == AppInstallationState.Installed || newState == AppInstallationState.Error)
+            {
+                var status = newState == AppInstallationState.Installed ? "completed" : "failed";
+                var shadowPayload = new Dictionary<string, string>(payload.Count + 1, StringComparer.Ordinal);
+                foreach (var kv in payload) shadowPayload[kv.Key] = kv.Value;
+                shadowPayload["status"] = status;
+                _post.Emit(
+                    eventType: SharedEventTypes.DownloadProgress,
+                    source: SourceLabel,
+                    message: $"{app.Name ?? app.Id}: {status}",
+                    severity: EventSeverity.Debug,
+                    immediateUpload: true,
+                    data: shadowPayload,
+                    occurredAtUtc: now);
+            }
+
             // PR3-D4: app state transitions are the heaviest cardinality observability target —
             // a forensic reader needs (oldState->newState, terminal flag, sub-phase emit) to
             // reconstruct why the UI shows what it shows.
diff --git a/src/Agent/AutopilotMonitor.Agent.V2/buildcounter.txt b/src/Agent/AutopilotMonitor.Agent.V2/buildcounter.txt
index 947e93bc..71627d71 100644
--- a/src/Agent/AutopilotMonitor.Agent.V2/buildcounter.txt
+++ b/src/Agent/AutopilotMonitor.Agent.V2/buildcounter.txt
@@ -1 +1 @@
-341
+348