diff --git a/lib/updater.js b/lib/updater.js
index 59be8ee..733084c 100644
--- a/lib/updater.js
+++ b/lib/updater.js
@@ -61,6 +61,10 @@ function findLatestYml(assets) {
   return assets.find(a => /^latest\.yml$/i.test(a.name)) || null;
 }
 
+function normalizeInstallerName(value) {
+  return path.basename(String(value || '')).toLowerCase().replace(/[ ._]+/g, '');
+}
+
 async function fetchJson(url, signal) {
   const controller = new AbortController();
   const timeout = setTimeout(() => controller.abort(), CHECK_TIMEOUT);
@@ -180,7 +184,7 @@ async function parseLatestYml(url, expected = {}, fetchImpl = fetch) {
     if (expected.version && version !== expected.version) {
       throw new Error('Prüfsummen-Metadaten gehören zu einer anderen Version');
     }
-    if (expected.assetName && path.basename(assetPath) !== path.basename(expected.assetName)) {
+    if (expected.assetName && normalizeInstallerName(assetPath) !== normalizeInstallerName(expected.assetName)) {
       throw new Error('Prüfsummen-Metadaten gehören nicht zum ausgewählten Installer');
     }
     if (expected.assetSize && size !== Number(expected.assetSize)) {
diff --git a/tests/updater-version.test.js b/tests/updater-version.test.js
index f73b715..2db6d33 100644
--- a/tests/updater-version.test.js
+++ b/tests/updater-version.test.js
@@ -336,3 +336,18 @@ test('existing release recovery rejects a mismatched transport tag', async () =>
     /existing release tag "v9\.9\.9" does not match "v2\.1\.20"/
   );
 });
+
+test('checksum metadata accepts equivalent transport-specific installer separators', async () => {
+  const sha = crypto.randomBytes(64).toString('base64');
+  const metadata = await parseLatestYml('https://update.invalid/latest.yml', {
+    version: '2.1.22',
+    assetName: 'Multi-Hoster-Upload Setup 2.1.22.exe',
+    assetSize: 456
+  }, async () => ({
+    ok: true,
+    status: 200,
+    text: async () => `version: 2.1.22\npath: Multi-Hoster-Upload.Setup.2.1.22.exe\nsha512: ${sha}\nsize: 456\n`
+  }));
+
+  assert.equal(metadata.path, 'Multi-Hoster-Upload.Setup.2.1.22.exe');
+});