diff --git a/tools/ghidra_scripts/import_functions_from_pdb.py b/tools/ghidra_scripts/import_functions_from_pdb.py
index 0a970eae..717f849c 100644
--- a/tools/ghidra_scripts/import_functions_from_pdb.py
+++ b/tools/ghidra_scripts/import_functions_from_pdb.py
@@ -188,7 +188,9 @@ def process_functions(isle_compare: "IsleCompare"):
             cause = e.args[0]
             if CancelledException is not None and isinstance(cause, CancelledException):
                 # let Ghidra's CancelledException pass through
-                raise
+                logging.critical("Import aborted by the user.")
+                return
+
             log_and_track_failure(cause, unexpected=True)
         except Exception as e:  # pylint: disable=broad-exception-caught
             log_and_track_failure(e, unexpected=True)
diff --git a/tools/ghidra_scripts/lego_util/exceptions.py b/tools/ghidra_scripts/lego_util/exceptions.py
index b1beb53f..f120e717 100644
--- a/tools/ghidra_scripts/lego_util/exceptions.py
+++ b/tools/ghidra_scripts/lego_util/exceptions.py
@@ -8,10 +8,10 @@ def __str__(self):
 
 
 class ClassOrNamespaceNotFoundInGhidraError(Lego1Exception):
-    def __init__(self, namespaceHierachy):  # type: (list[str]) -> None
+    def __init__(self, namespaceHierachy: list[str]):
         super().__init__(namespaceHierachy)
 
-    def get_namespace_str(self):  # type: () -> str
+    def get_namespace_str(self) -> str:
         return "::".join(self.args[0])
 
     def __str__(self):
diff --git a/tools/ghidra_scripts/lego_util/ghidra_helper.py b/tools/ghidra_scripts/lego_util/ghidra_helper.py
index eed88763..00a8e394 100644
--- a/tools/ghidra_scripts/lego_util/ghidra_helper.py
+++ b/tools/ghidra_scripts/lego_util/ghidra_helper.py
@@ -17,7 +17,7 @@
 from ghidra.program.model.symbol import Namespace
 
 
-def get_ghidra_type(api, type_name):  # type: (FlatProgramAPI, str) -> DataType
+def get_ghidra_type(api: FlatProgramAPI, type_name: str):
     """
     Searches for the type named `typeName` in Ghidra.
 
@@ -44,7 +44,7 @@ def get_ghidra_type(api, type_name):  # type: (FlatProgramAPI, str) -> DataType
     raise MultipleTypesFoundInGhidraError(type_name, result)
 
 
-def add_pointer_type(api, pointee):  # type: (FlatProgramAPI, DataType) -> DataType
+def add_pointer_type(api: FlatProgramAPI, pointee: DataType):
     data_type = PointerDataType(pointee)
     data_type.setCategoryPath(pointee.getCategoryPath())
     api.getCurrentProgram().getDataTypeManager().addDataType(
@@ -54,9 +54,7 @@ def add_pointer_type(api, pointee):  # type: (FlatProgramAPI, DataType) -> DataT
     return data_type
 
 
-def get_ghidra_namespace(
-    api, namespace_hierachy
-):  # type: (FlatProgramAPI, list[str]) -> Namespace
+def get_ghidra_namespace(api: FlatProgramAPI, namespace_hierachy: list[str]) -> Namespace:
     namespace = api.getCurrentProgram().getGlobalNamespace()
     for part in namespace_hierachy:
         namespace = api.getNamespace(namespace, part)
diff --git a/tools/ghidra_scripts/lego_util/pdb_extraction.py b/tools/ghidra_scripts/lego_util/pdb_extraction.py
index c58ddef6..3515d9d6 100644
--- a/tools/ghidra_scripts/lego_util/pdb_extraction.py
+++ b/tools/ghidra_scripts/lego_util/pdb_extraction.py
@@ -1,6 +1,6 @@
 from dataclasses import dataclass
 import re
-from typing import Any
+from typing import Any, Optional
 import logging
 
 from isledecomp.cvdump.symbols import SymbolsEntry
@@ -38,7 +38,7 @@ class FunctionSignature:
     call_type: str
     arglist: list[str]
     return_type: str
-    class_type: dict[str, Any] | None
+    class_type: Optional[dict[str, Any]]
     stack_symbols: list[CppStackOrRegisterSymbol]
 
 
@@ -67,7 +67,7 @@ def scalar_type_to_cpp(self, scalar_type: str) -> str:
             return f"{self.scalar_type_to_cpp(scalar_type[3:])} *"
         return self._scalar_type_map.get(scalar_type, scalar_type)
 
-    def lookup_type(self, type_name: str | None) -> dict[str, Any] | None:
+    def lookup_type(self, type_name: Optional[str]) -> Optional[dict[str, Any]]:
         return (
             None
             if type_name is None
@@ -114,7 +114,7 @@ def type_to_cpp_type_name(self, type_name: str) -> str:
         logger.error("Unknown type: %s", dereferenced)
         return "<<parsing error>>"
 
-    def get_func_signature(self, fn: "SymbolsEntry") -> FunctionSignature | None:
+    def get_func_signature(self, fn: SymbolsEntry) -> Optional[FunctionSignature]:
         function_type_str = fn.func_type
         if function_type_str == "T_NOTYPE(0000)":
             logger.debug(
@@ -181,7 +181,7 @@ def get_function_list(self) -> list[tuple[MatchInfo, FunctionSignature]]:
 
     def handle_matched_function(
         self, match_info: MatchInfo
-    ) -> tuple[MatchInfo, FunctionSignature] | None:
+    ) -> Optional[tuple[MatchInfo, FunctionSignature]]:
         assert match_info.orig_addr is not None
         match_options = self.compare._db.get_match_options(match_info.orig_addr)
         assert match_options is not None
diff --git a/tools/ghidra_scripts/lego_util/pdb_to_ghidra.py b/tools/ghidra_scripts/lego_util/pdb_to_ghidra.py
index ab0c0116..cbb67fbd 100644
--- a/tools/ghidra_scripts/lego_util/pdb_to_ghidra.py
+++ b/tools/ghidra_scripts/lego_util/pdb_to_ghidra.py
@@ -4,6 +4,7 @@
 # pyright: reportMissingModuleSource=false
 
 import logging
+from typing import Optional
 
 from ghidra.program.model.listing import Function, Parameter
 from ghidra.program.flatapi import FlatProgramAPI
@@ -33,9 +34,9 @@ class PdbFunctionWithGhidraObjects:
 
     def __init__(
         self,
-        fpapi: "FlatProgramAPI",
-        match_info: "MatchInfo",
-        signature: "FunctionSignature",
+        fpapi: FlatProgramAPI,
+        match_info: MatchInfo,
+        signature: FunctionSignature,
     ):
         self.api = fpapi
         self.match_info = match_info
@@ -74,7 +75,7 @@ def format_proposed_change(self) -> str:
             + f"({', '.join(self.signature.arglist)})"
         )
 
-    def matches_ghidra_function(self, ghidra_function):  # type: (Function) -> bool
+    def matches_ghidra_function(self, ghidra_function: Function) -> bool:
         """Checks whether this function declaration already matches the description in Ghidra"""
         name_match = self.name == ghidra_function.getName(False)
         namespace_match = self.namespace == ghidra_function.getParentNamespace()
@@ -109,12 +110,10 @@ def matches_ghidra_function(self, ghidra_function):  # type: (Function) -> bool
             and args_match
         )
 
-    def _matches_non_thiscall_parameters(
-        self, ghidra_function
-    ):  # type: (Function) -> bool
+    def _matches_non_thiscall_parameters(self, ghidra_function: Function) -> bool:
         return self._parameter_lists_match(ghidra_function.getParameters())
 
-    def _matches_thiscall_parameters(self, ghidra_function: "Function") -> bool:
+    def _matches_thiscall_parameters(self, ghidra_function: Function) -> bool:
         ghidra_params = list(ghidra_function.getParameters())
 
         # remove the `this` argument which we don't generate ourselves
@@ -151,7 +150,7 @@ def _parameter_lists_match(self, ghidra_params: "list[Parameter]") -> bool:
                 return False
         return True
 
-    def overwrite_ghidra_function(self, ghidra_function):  # type: (Function) -> None
+    def overwrite_ghidra_function(self, ghidra_function: Function):
         """Replace the function declaration in Ghidra by the one derived from C++."""
         ghidra_function.setName(self.name, SourceType.USER_DEFINED)
         ghidra_function.setParentNamespace(self.namespace)
@@ -168,7 +167,7 @@ def overwrite_ghidra_function(self, ghidra_function):  # type: (Function) -> Non
         # When we set the parameters, Ghidra will generate the layout.
         # Now we read them again and match them against the stack layout in the PDB,
         # both to verify and to set the parameter names.
-        ghidra_parameters: "list[ghidra.program.model.listing.Parameter]" = ghidra_function.getParameters()  # type: ignore
+        ghidra_parameters: list[Parameter] = ghidra_function.getParameters()
 
         # Try to add Ghidra function names
         for param in ghidra_parameters:
@@ -195,7 +194,7 @@ def overwrite_ghidra_function(self, ghidra_function):  # type: (Function) -> Non
                 #     )
                 #     continue
 
-    def _rename_stack_parameter(self, param: "Parameter"):
+    def _rename_stack_parameter(self, param: Parameter):
         match = self.get_matching_stack_symbol(param.getStackOffset())
         if match is None:
             raise StackOffsetMismatchError(
@@ -210,7 +209,7 @@ def _rename_stack_parameter(self, param: "Parameter"):
 
         param.setName(match.name, SourceType.USER_DEFINED)
 
-    def get_matching_stack_symbol(self, stack_offset: int) -> "CppStackSymbol | None":
+    def get_matching_stack_symbol(self, stack_offset: int) -> Optional[CppStackSymbol]:
         return next(
             (
                 symbol
@@ -221,7 +220,7 @@ def get_matching_stack_symbol(self, stack_offset: int) -> "CppStackSymbol | None
             None,
         )
 
-    def get_matching_register_symbol(self, register: str) -> "CppRegisterSymbol | None":
+    def get_matching_register_symbol(self, register: str) -> Optional[CppRegisterSymbol]:
         return next(
             (
                 symbol
diff --git a/tools/isledecomp/isledecomp/cvdump/analysis.py b/tools/isledecomp/isledecomp/cvdump/analysis.py
index a8b6a702..40ef292e 100644
--- a/tools/isledecomp/isledecomp/cvdump/analysis.py
+++ b/tools/isledecomp/isledecomp/cvdump/analysis.py
@@ -33,8 +33,8 @@ class CvdumpNode:
     # Size as reported by SECTION CONTRIBUTIONS section. Not guaranteed to be
     # accurate.
     section_contribution: Optional[int] = None
-    addr: int | None = None
-    symbol_entry: SymbolsEntry | None = None
+    addr: Optional[int] = None
+    symbol_entry: Optional[SymbolsEntry] = None
 
     def __init__(self, section: int, offset: int) -> None:
         self.section = section
diff --git a/tools/isledecomp/isledecomp/cvdump/symbols.py b/tools/isledecomp/isledecomp/cvdump/symbols.py
index 175d8aca..27935de5 100644
--- a/tools/isledecomp/isledecomp/cvdump/symbols.py
+++ b/tools/isledecomp/isledecomp/cvdump/symbols.py
@@ -1,6 +1,6 @@
 import logging
 import re
-from typing import NamedTuple
+from typing import NamedTuple, Optional
 
 
 logger = logging.getLogger(__name__)
@@ -23,7 +23,7 @@ class SymbolsEntry(NamedTuple):
     func_type: str
     name: str
     stack_symbols: list[StackOrRegisterSymbol]
-    addr: int | None  # absolute address, to be set later
+    addr: Optional[int]  # absolute address, to be set later
 
 
 class CvdumpSymbolsParser:
@@ -81,7 +81,7 @@ def read_line(self, line: str):
             return
 
         symbol_type: str = match.group("symbol_type")
-        second_part: str | None = match.group("second_part")
+        second_part: Optional[str] = match.group("second_part")
 
         if symbol_type == "S_GPROC32":
             assert second_part is not None