Unhiding UML2 5.4.1.
diff --git a/downloads/hidden.txt b/downloads/hidden.txt
index 158b85f..e92c992 100644
--- a/downloads/hidden.txt
+++ b/downloads/hidden.txt
@@ -1,3 +1,2 @@
-modeling/mdt/5.4.1/R201809031400
 modeling/mdt/6.5.0/R201809100900
 modeling/mdt/6.5.0/R201809161223