diff --git a/plugins/VersionUpgrade/VersionUpgrade21to22/VersionUpgrade21to22.py b/plugins/VersionUpgrade/VersionUpgrade21to22/VersionUpgrade21to22.py
index 89c847e606..536385b19d 100644
--- a/plugins/VersionUpgrade/VersionUpgrade21to22/VersionUpgrade21to22.py
+++ b/plugins/VersionUpgrade/VersionUpgrade21to22/VersionUpgrade21to22.py
@@ -251,7 +251,7 @@ class VersionUpgrade21to22(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
 
     ##  Gets the fallback quality to use for a specific machine-variant-material
diff --git a/plugins/VersionUpgrade/VersionUpgrade22to24/VersionUpgrade.py b/plugins/VersionUpgrade/VersionUpgrade22to24/VersionUpgrade.py
index 48af365877..dac73683bb 100644
--- a/plugins/VersionUpgrade/VersionUpgrade22to24/VersionUpgrade.py
+++ b/plugins/VersionUpgrade/VersionUpgrade22to24/VersionUpgrade.py
@@ -156,5 +156,5 @@ class VersionUpgrade22to24(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
diff --git a/plugins/VersionUpgrade/VersionUpgrade25to26/VersionUpgrade25to26.py b/plugins/VersionUpgrade/VersionUpgrade25to26/VersionUpgrade25to26.py
index 5c9b94cca3..6dbcfebc46 100644
--- a/plugins/VersionUpgrade/VersionUpgrade25to26/VersionUpgrade25to26.py
+++ b/plugins/VersionUpgrade/VersionUpgrade25to26/VersionUpgrade25to26.py
@@ -43,7 +43,7 @@ class VersionUpgrade25to26(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
 
     ##  Upgrades the preferences file from version 2.5 to 2.6.
diff --git a/plugins/VersionUpgrade/VersionUpgrade26to27/VersionUpgrade26to27.py b/plugins/VersionUpgrade/VersionUpgrade26to27/VersionUpgrade26to27.py
index 96307ca43c..39e3dea4ed 100644
--- a/plugins/VersionUpgrade/VersionUpgrade26to27/VersionUpgrade26to27.py
+++ b/plugins/VersionUpgrade/VersionUpgrade26to27/VersionUpgrade26to27.py
@@ -84,7 +84,7 @@ class VersionUpgrade26to27(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
 
     ##  Upgrades a preferences file from version 2.6 to 2.7.
@@ -92,7 +92,7 @@ class VersionUpgrade26to27(VersionUpgrade):
     #   \param serialised The serialised form of a preferences file.
     #   \param filename The name of the file to upgrade.
     def upgradePreferences(self, serialised: str, filename: str) -> Tuple[List[str], List[str]]:
-        parser = configparser.ConfigParser(interpolation=None)
+        parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
 
         # Update version numbers
diff --git a/plugins/VersionUpgrade/VersionUpgrade27to30/VersionUpgrade27to30.py b/plugins/VersionUpgrade/VersionUpgrade27to30/VersionUpgrade27to30.py
index c9e9e41f7e..b594c3c6c4 100644
--- a/plugins/VersionUpgrade/VersionUpgrade27to30/VersionUpgrade27to30.py
+++ b/plugins/VersionUpgrade/VersionUpgrade27to30/VersionUpgrade27to30.py
@@ -48,7 +48,7 @@ class VersionUpgrade27to30(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
 
     ##  Upgrades a preferences file from version 2.7 to 3.0.
@@ -158,7 +158,7 @@ class VersionUpgrade27to30(VersionUpgrade):
     #   \param serialised The serialised form of the container file.
     #   \param filename The name of the file to upgrade.
     def upgradeOtherContainer(self, serialised: str, filename: str) -> Tuple[List[str], List[str]]:
-        parser = configparser.ConfigParser(interpolation=None)
+        parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
 
         # Update the skin pre-shrink settings:
diff --git a/plugins/VersionUpgrade/VersionUpgrade30to31/VersionUpgrade30to31.py b/plugins/VersionUpgrade/VersionUpgrade30to31/VersionUpgrade30to31.py
index 74467d67c6..f0b2e939b9 100644
--- a/plugins/VersionUpgrade/VersionUpgrade30to31/VersionUpgrade30to31.py
+++ b/plugins/VersionUpgrade/VersionUpgrade30to31/VersionUpgrade30to31.py
@@ -77,7 +77,7 @@ class VersionUpgrade30to31(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
 
     ##  Upgrades a preferences file from version 3.0 to 3.1.
diff --git a/plugins/VersionUpgrade/VersionUpgrade32to33/VersionUpgrade32to33.py b/plugins/VersionUpgrade/VersionUpgrade32to33/VersionUpgrade32to33.py
index 5be58eab3b..83cb15c864 100644
--- a/plugins/VersionUpgrade/VersionUpgrade32to33/VersionUpgrade32to33.py
+++ b/plugins/VersionUpgrade/VersionUpgrade32to33/VersionUpgrade32to33.py
@@ -83,7 +83,7 @@ class VersionUpgrade32to33(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
 
     ##  Upgrades a preferences file from version 3.2 to 3.3.
diff --git a/plugins/VersionUpgrade/VersionUpgrade33to34/VersionUpgrade33to34.py b/plugins/VersionUpgrade/VersionUpgrade33to34/VersionUpgrade33to34.py
index 5077dda8ad..704ede02d6 100644
--- a/plugins/VersionUpgrade/VersionUpgrade33to34/VersionUpgrade33to34.py
+++ b/plugins/VersionUpgrade/VersionUpgrade33to34/VersionUpgrade33to34.py
@@ -29,7 +29,7 @@ class VersionUpgrade33to34(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
 
     ##  Upgrades instance containers to have the new version
diff --git a/plugins/VersionUpgrade/VersionUpgrade34to35/VersionUpgrade34to35.py b/plugins/VersionUpgrade/VersionUpgrade34to35/VersionUpgrade34to35.py
index 88cc3ca420..d930b6e217 100644
--- a/plugins/VersionUpgrade/VersionUpgrade34to35/VersionUpgrade34to35.py
+++ b/plugins/VersionUpgrade/VersionUpgrade34to35/VersionUpgrade34to35.py
@@ -78,7 +78,7 @@ class VersionUpgrade34to35(VersionUpgrade):
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
-        setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
         return format_version * 1000000 + setting_version
 
     ##  Upgrades Preferences to have the new version number.