Unhiding UML2 5.4.0.
diff --git a/downloads/hidden.txt b/downloads/hidden.txt
index 4bb1e2f..8436787 100644
--- a/downloads/hidden.txt
+++ b/downloads/hidden.txt
@@ -1,2 +1 @@
-modeling/mdt/5.4.0/R201806041153
 modeling/mdt/6.4.0/R201806111119
\ No newline at end of file