diff --git a/hledger-install/hledger-install.sh b/hledger-install/hledger-install.sh
index cde7b9cb3..7c7e29ef4 100755
--- a/hledger-install/hledger-install.sh
+++ b/hledger-install/hledger-install.sh
@@ -50,7 +50,7 @@ HERE
 HLEDGER_INSTALL_TOOL=hledger-install.sh
 
 # this script's version
-HLEDGER_INSTALL_VERSION=20191203
+HLEDGER_INSTALL_VERSION=20191204
 
 # stackage snapshot to use when installing with stack.
 # You can try specifying a different stackage version here, or 
@@ -1025,19 +1025,19 @@ if [[ $(cmpver "$(cmd_version hledger-web 2>/dev/null)" $HLEDGER_WEB_VERSION) =
   echo
 fi
 
-# # Third-party addons. We sometimes build these with an older version
-# # of hledger[-lib], if their bounds have not been updated yet.
-# if [[ $(cmpver "$(cmd_version hledger-iadd 2>/dev/null)" $HLEDGER_IADD_VERSION) = 2 ]]; then
-#   echo Installing hledger-iadd
-#   try_install hledger-iadd-$HLEDGER_IADD_VERSION hledger-lib-$HLEDGER_LIB_VERSION $EXTRA_DEPS
-#   echo
-# fi
+# Third-party addons. We might build these with an older version
+# of hledger[-lib], if their bounds have not been updated yet.
+if [[ $(cmpver "$(cmd_version hledger-iadd 2>/dev/null)" $HLEDGER_IADD_VERSION) = 2 ]]; then
+  echo Installing hledger-iadd
+  try_install hledger-iadd-$HLEDGER_IADD_VERSION hledger-lib-$HLEDGER_LIB_VERSION $EXTRA_DEPS
+  echo
+fi
 
-# if [[ $(cmpver "$(cmd_version hledger-interest 2>/dev/null)" $HLEDGER_INTEREST_VERSION) = 2 ]]; then
-#   echo Installing hledger-interest
-#   try_install hledger-interest-$HLEDGER_INTEREST_VERSION hledger-lib-$HLEDGER_LIB_VERSION $EXTRA_DEPS
-#   echo
-# fi
+if [[ $(cmpver "$(cmd_version hledger-interest 2>/dev/null)" $HLEDGER_INTEREST_VERSION) = 2 ]]; then
+  echo Installing hledger-interest
+  try_install hledger-interest-$HLEDGER_INTEREST_VERSION hledger-lib-$HLEDGER_LIB_VERSION $EXTRA_DEPS
+  echo
+fi
 
 # show new installation status
 echo