diff --git a/package.json b/package.json
index 816aee5..87188d3 100644
--- a/package.json
+++ b/package.json
@@ -84,7 +84,10 @@
       "uninstallerIcon": "static/icons/icon.ico",
       "installerHeaderIcon": "static/icons/icon.ico",
       "shortcutName": "Scoreko",
-      "useZip": false
+      "useZip": false,
+      "deleteAppDataOnUninstall": true,
+      "showInstDetails": "show",
+      "showUninstDetails": "show"
     },
     "compression": "normal"
   },
diff --git a/src/main/updates/update-dialogs.ts b/src/main/updates/update-dialogs.ts
index d448fae..48e7695 100644
--- a/src/main/updates/update-dialogs.ts
+++ b/src/main/updates/update-dialogs.ts
@@ -41,6 +41,22 @@ export async function askToInstallUpdate(update: ReleaseUpdate, parentWindow: Br
   return result.response === 0;
 }
 
+export async function showDownloadFailedDialog(
+  update: ReleaseUpdate,
+  error: unknown,
+  parentWindow: BrowserWindow | null,
+): Promise<void> {
+  const errorMessage = error instanceof Error ? error.message : String(error);
+  await showMessageBox(parentWindow, {
+    type: "error",
+    title: "Error de descarga",
+    message: `No se pudo descargar la actualización para Scoreko ${update.version}.`,
+    detail: `Detalles del error: ${errorMessage}\n\nPor favor, comprueba tu conexión a internet e inténtalo de nuevo.`,
+    buttons: ["Aceptar"],
+    defaultId: 0,
+  });
+}
+
 function showMessageBox(
   parentWindow: BrowserWindow | null,
   options: MessageBoxOptions,
diff --git a/src/main/updates/update-download.ts b/src/main/updates/update-download.ts
index 5e58d51..dd36419 100644
--- a/src/main/updates/update-download.ts
+++ b/src/main/updates/update-download.ts
@@ -23,6 +23,13 @@ export async function downloadInstaller(update: ReleaseUpdate, config: UpdateDow
   const targetPath = getSafeChildPath(downloadDirectory, safeFileName);
   const stagingPath = getSafeChildPath(downloadDirectory, `${safeFileName}.${process.pid}.${Date.now()}.download`);
 
+  if (fs.existsSync(targetPath)) {
+    const stats = fs.statSync(targetPath);
+    if (typeof update.installer.size === "number" && stats.size === update.installer.size) {
+      return targetPath;
+    }
+  }
+
   fs.mkdirSync(downloadDirectory, { recursive: true });
   fs.rmSync(stagingPath, { force: true });
 
diff --git a/src/main/updates/update-service.ts b/src/main/updates/update-service.ts
index 5b74477..d350c71 100644
--- a/src/main/updates/update-service.ts
+++ b/src/main/updates/update-service.ts
@@ -1,7 +1,7 @@
 import { app, BrowserWindow, shell } from "electron";
 
 import { AppRuntimeConfig } from "../config/runtime-config";
-import { askToDownloadUpdate, askToInstallUpdate } from "./update-dialogs";
+import { askToDownloadUpdate, askToInstallUpdate, showDownloadFailedDialog } from "./update-dialogs";
 import { loadUpdateSettings, UpdateSettings } from "./update-config";
 import { downloadInstaller } from "./update-download";
 import { buildReleaseUpdate, GiteaRelease, parseGiteaRelease } from "./update-schema";
@@ -76,10 +76,17 @@ async function checkForUpdates({
       return;
     }
 
-    const installerPath = await downloadInstaller(update, {
-      tempDirectory: app.getPath("temp"),
-      allowInsecureHttp: protocolPolicy.allowInsecureHttp,
-    });
+    let installerPath: string;
+    try {
+      installerPath = await downloadInstaller(update, {
+        tempDirectory: app.getPath("temp"),
+        allowInsecureHttp: protocolPolicy.allowInsecureHttp,
+      });
+    } catch (error) {
+      log("Update installer download failed.", error);
+      await showDownloadFailedDialog(update, error, getParentWindow());
+      return;
+    }
     const shouldInstall = await askToInstallUpdate(update, getParentWindow());
     if (!shouldInstall) {
       await shell.showItemInFolder(installerPath);
diff --git a/src/tests/update-download.test.ts b/src/tests/update-download.test.ts
index 566b891..6259f45 100644
--- a/src/tests/update-download.test.ts
+++ b/src/tests/update-download.test.ts
@@ -56,3 +56,38 @@ test("downloadInstaller rejects insecure production download URLs", async () =>
     /unsupported protocol/,
   );
 });
+
+test("downloadInstaller reuses existing file if size matches and does not download again", async () => {
+  const tempDirectory = fs.mkdtempSync(path.join(os.tmpdir(), "scoreko-update-download-"));
+  const downloadDirectory = path.join(tempDirectory, "scoreko-updates");
+  fs.mkdirSync(downloadDirectory, { recursive: true });
+
+  const installerPath = path.join(downloadDirectory, "Scoreko_setup_0.2.0.exe");
+  fs.writeFileSync(installerPath, "cached-installer-bytes");
+  const cachedSize = fs.statSync(installerPath).size;
+
+  const previousFetch = globalThis.fetch;
+  globalThis.fetch = async () => {
+    throw new Error("Should not fetch when using cached file!");
+  };
+
+  try {
+    const resultPath = await downloadInstaller(
+      {
+        version: "0.2.0",
+        title: "Scoreko 0.2.0",
+        installer: {
+          name: "Scoreko/setup:0.2.0.exe",
+          downloadUrl: "https://updates.local/Scoreko-setup-0.2.0.exe",
+          size: cachedSize,
+        },
+      },
+      { tempDirectory, allowInsecureHttp: false },
+    );
+
+    assert.equal(resultPath, installerPath);
+    assert.equal(fs.readFileSync(resultPath, "utf8"), "cached-installer-bytes");
+  } finally {
+    globalThis.fetch = previousFetch;
+  }
+});