diff --git a/plugins/VersionUpgrade/VersionUpgrade48to49/VersionUpgrade48to49.py b/plugins/VersionUpgrade/VersionUpgrade48to49/VersionUpgrade48to49.py
index 19367bc43a..0ec1bbe42a 100644
--- a/plugins/VersionUpgrade/VersionUpgrade48to49/VersionUpgrade48to49.py
+++ b/plugins/VersionUpgrade/VersionUpgrade48to49/VersionUpgrade48to49.py
@@ -36,6 +36,51 @@ class VersionUpgrade48to49(VersionUpgrade):
         parser.write(result)
         return [filename], [result.getvalue()]
 
+    def upgradeStack(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        """
+        Upgrades stacks to have the new version number.
+
+        This updates the post-processing scripts with new parameters.
+        :param serialized: The original contents of the stack.
+        :param filename: The original file name of the stack.
+        :return: A list of new file names, and a list of the new contents for
+        those files.
+        """
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialized)
+
+        # Update version number.
+        if "metadata" not in parser:
+            parser["metadata"] = {}
+        parser["metadata"]["setting_version"] = "17"
+
+        # Update Display Progress on LCD script parameters if present.
+        if "post_processing_scripts" in parser["metadata"]:
+            new_scripts_entries = []
+            for script_str in parser["metadata"]["post_processing_scripts"].split("\n"):
+                if not script_str:
+                    continue
+                script_str = script_str.replace(r"\\\n", "\n").replace(r"\\\\", "\\\\")  # Unescape escape sequences.
+                script_parser = configparser.ConfigParser(interpolation=None)
+                script_parser.optionxform = str  # type: ignore  # Don't transform the setting keys as they are case-sensitive.
+                script_parser.read_string(script_str)
+
+                # Update Display Progress on LCD parameters.
+                script_id = script_parser.sections()[0]
+                if script_id == "DisplayProgressOnLCD":
+                    script_parser[script_id]["time_remaining"] = "m117" if script_parser[script_id]["time_remaining"] == "True" else "none"
+
+                script_io = io.StringIO()
+                script_parser.write(script_io)
+                script_str = script_io.getvalue()
+                script_str = script_str.replace("\\\\", r"\\\\").replace("\n", r"\\\n")  # Escape newlines because configparser sees those as section delimiters.
+                new_scripts_entries.append(script_str)
+            parser["metadata"]["post_processing_scripts"] = "\n".join(new_scripts_entries)
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
+
     def upgradeSettingVisibility(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
         """
         Upgrades setting visibility to have a version number and move moved settings to a different category
diff --git a/plugins/VersionUpgrade/VersionUpgrade48to49/__init__.py b/plugins/VersionUpgrade/VersionUpgrade48to49/__init__.py
index a5c543be62..fd46dd8123 100644
--- a/plugins/VersionUpgrade/VersionUpgrade48to49/__init__.py
+++ b/plugins/VersionUpgrade/VersionUpgrade48to49/__init__.py
@@ -15,13 +15,23 @@ def getMetaData() -> Dict[str, Any]:
         "version_upgrade": {
             # From                           To                              Upgrade function
             ("preferences", 6000016):        ("preferences", 7000016,        upgrade.upgradePreferences),
-            ("setting_visibility", 1000000): ("setting_visibility", 2000017, upgrade.upgradeSettingVisibility),
+            ("machine_stack", 4000016):      ("machine_stack", 5000016,      upgrade.upgradeStack),
+            ("extruder_train", 4000016):     ("extruder_train", 5000016,     upgrade.upgradeStack),
+            ("setting_visibility", 1000000): ("setting_visibility", 2000016, upgrade.upgradeSettingVisibility),
         },
         "sources": {
             "preferences": {
                 "get_version": upgrade.getCfgVersion,
                 "location": {"."}
             },
+            "machine_stack": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./machine_instances"}
+            },
+            "extruder_train": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./extruders"}
+            },
             "setting_visibility": {
                 "get_version": upgrade.getCfgVersion,
                 "location": {"./setting_visibility"}