diff --git a/src/TeamsISO.Engine/Interop/NdiRuntimeProbe.cs b/src/TeamsISO.Engine/Interop/NdiRuntimeProbe.cs
index 48e17cf..ed2278a 100644
--- a/src/TeamsISO.Engine/Interop/NdiRuntimeProbe.cs
+++ b/src/TeamsISO.Engine/Interop/NdiRuntimeProbe.cs
@@ -11,25 +11,26 @@ public abstract record NdiRuntimeProbeResult
 
 /// <summary>
 /// Compares the installed NDI runtime version (read via <see cref="INdiInterop.GetRuntimeVersion"/>)
-/// against the version expected by the bundled SDK headers. Surfaces mismatches so the engine
-/// can raise <c>EngineAlert.NdiRuntimeMismatch</c>.
+/// against an expected prefix supplied at construction. Prefix matching is used because the NDI
+/// runtime reports a longer string (e.g. "NDI SDK for Windows v6.0.1.0") and we typically only
+/// care that the major SDK family is correct ("NDI SDK for Windows v6").
 /// </summary>
 public sealed class NdiRuntimeProbe
 {
     private readonly INdiInterop _interop;
-    private readonly string _expectedVersion;
+    private readonly string _expectedPrefix;
 
     public NdiRuntimeProbe(INdiInterop interop, string expectedVersion)
     {
         _interop = interop;
-        _expectedVersion = expectedVersion;
+        _expectedPrefix = expectedVersion;
     }
 
     public NdiRuntimeProbeResult Probe()
     {
         var detected = _interop.GetRuntimeVersion();
-        return string.Equals(detected, _expectedVersion, StringComparison.Ordinal)
+        return detected.StartsWith(_expectedPrefix, StringComparison.Ordinal)
             ? new NdiRuntimeProbeResult.Match(detected)
-            : new NdiRuntimeProbeResult.Mismatch(detected, _expectedVersion);
+            : new NdiRuntimeProbeResult.Mismatch(detected, _expectedPrefix);
     }
 }