diff --git a/cockatrice/src/client/network/update/client/release_channel.cpp b/cockatrice/src/client/network/update/client/release_channel.cpp
index b760c021c..f401dfd00 100644
--- a/cockatrice/src/client/network/update/client/release_channel.cpp
+++ b/cockatrice/src/client/network/update/client/release_channel.cpp
@@ -27,6 +27,29 @@
 
 #define GIT_SHORT_HASH_LEN 7
 
+namespace
+{
+
+#if defined(Q_OS_MACOS) || defined(Q_OS_WIN)
+// QSysInfo::productVersion() is not guaranteed to start with a number, e.g. it returns
+// "Server 2022" on Windows Server. Use the first numeric token as the major host version.
+std::optional<int> getProductVersionMajor()
+{
+    const QString versionString = QSysInfo::productVersion();
+    bool ok = false;
+    static const QRegularExpression firstNumber(R"((\d+))");
+    const auto match = firstNumber.match(versionString);
+    const int version = match.hasMatch() ? match.captured(1).toInt(&ok) : 0;
+    if (!ok) {
+        qCWarning(ReleaseChannelLog) << "Unable to determine OS version from" << versionString;
+        return std::nullopt;
+    }
+    return version;
+}
+#endif
+
+} // namespace
+
 ReleaseChannel::ReleaseChannel() : netMan(new QNetworkAccessManager(this)), response(nullptr), lastRelease(nullptr)
 {
 }
@@ -47,18 +70,21 @@ void ReleaseChannel::checkForUpdates()
 // Find assets compatible with host platform (Linux is not supported by in-client updater)
 std::optional<int> ReleaseChannel::getTargetVersionForCurrentOS(const QString &fileName)
 {
+#if defined(Q_OS_WIN) && Q_PROCESSOR_WORDSIZE == 4
+    // The published Windows assets are 64-bit only
+    Q_UNUSED(fileName);
+    return std::nullopt;
+#endif
+
     const QRegularExpression *regex = nullptr;
 
-    static const std::optional<int> systemVersion = [] {
-        bool ok = false;
-        const QString versionString = QSysInfo::productVersion();
-        const int version = versionString.split('.').first().toInt(&ok);
-        if (!ok) {
-            qCWarning(ReleaseChannelLog) << "Unable to determine OS version from" << versionString;
-            return std::optional<int>();
-        }
-        return std::optional<int>{version};
-    }();
+    // Only platforms shipping updater assets (macOS, Windows) need the host version
+    static const std::optional<int> systemVersion =
+#if defined(Q_OS_MACOS) || defined(Q_OS_WIN)
+        getProductVersionMajor();
+#else
+        std::nullopt;
+#endif
 
     if (!systemVersion) {
         return std::nullopt;