diff --git a/ruff.toml b/ruff.toml
@@ -0,0 +1,23 @@
+[lint]
+# When using Ruff to check source correctness, feel free to aggressively add
+# codes to ignore. We don't care to use it as a nitpicker, just a quick way to
+# check for actual incorrect code.
+ignore = [
+    "B006",
+    "BLE001",
+    "C401",
+    "C408",
+    "FURB",
+    "G010",
+    "I001",
+    "PIE808",
+    "PLC",
+    "PLR1730",
+    "RUF012",
+    "RUF015",
+    "RUF022",
+    "RUF059",
+    "SIM",
+    "UP012",
+    "UP032",
+]
diff --git a/src/manage/commands.py b/src/manage/commands.py
@@ -27,6 +27,7 @@
 
 
 HELP_URL = "https://docs.python.org/using/windows"
+CHANGELOG_URL = f"https://github.com/python/pymanager/releases/tag/{__version__}"
 
 
 COPYRIGHT = f"""Python installation manager {__version__}
@@ -40,8 +41,15 @@
 
 WELCOME = f"""!B!Python install manager was successfully updated to {__version__}.!W!
 
-Additional shebang configuration is now available. Please see
-!B!{HELP_URL}#shebang-lines!W! for more information.
+Please see !B!{CHANGELOG_URL}!W! for all changes.
+"""
+
+# Temporarily use an ARM64-specific welcome message
+# This should be reverted around October 2027.
+WELCOME_ARM64 = f"""!B!Python install manager was successfully updated to {__version__}.!W!
+
+The default platform on this PC is now !Y!-arm64!W! instead of !Y!-64!W!.
+Please see !B!{CHANGELOG_URL}!W! for more details and all other changes.
 """
 
 # The 'py help' or 'pymanager help' output is constructed by these default docs,
@@ -533,13 +541,22 @@ def show_welcome(self, copyright=True):
             if __version__ == "0.1a0":
                 last_update_file.unlink()
             return
+
+        # Temporarily use an ARM64-specific welcome message
+        # This should be reverted around October 2027.
+        from _native import get_processor_architecture
+        if get_processor_architecture() == "-arm64":
+            msg = WELCOME_ARM64
+        else:
+            msg = WELCOME
+
         try:
             ensure_tree(last_update_file)
-            last_update_file.write_text(f"{__version__}\n\n{WELCOME}")
+            last_update_file.write_text(f"{__version__}\n\n{msg}")
         except OSError:
             LOGGER.debug("Failed to update %s", last_update_file, exc_info=True)
             return
-        LOGGER.info(WELCOME)
+        LOGGER.info(msg)
 
     def dump_arguments(self):
         try:

diff --git a/src/manage/install_command.py b/src/manage/install_command.py
@@ -371,13 +371,13 @@ def print_cli_shortcuts(cmd):
         if not verbose:
             if i.get("default"):
                 LOGGER.debug("%s will be launched by !G!python.exe!W!", i["display-name"])
-            names = get_install_alias_names(aliases, windowed=True)
+            names = get_install_alias_names(aliases, windowed=True, default_platform=cmd.default_platform)
             LOGGER.debug("%s will be launched by %s", i["display-name"], ", ".join(names))
 
         if not install_matches_any(i, tags):
             continue
 
-        names = get_install_alias_names(aliases, windowed=False)
+        names = get_install_alias_names(aliases, windowed=False, default_platform=cmd.default_platform)
         if i.get("default") and names:
             LOGGER.info("%s will be launched by !G!python.exe!W! and also %s",
                         i["display-name"], ", ".join(names))

diff --git a/src/manage/installs.py b/src/manage/installs.py
@@ -148,12 +148,19 @@ def _make_alias_key(alias):
     return n1, w, n2, plat, n3
 
 
-def _make_opt_part(parts):
+def _make_opt_part(parts, default=""):
     if not parts:
         return ""
-    if len(parts) == 1:
-        return list(parts)[0]
-    return "[{}]".format("|".join(sorted(p for p in parts if p)))
+    # If there's an explicit default, then we ignore empty parts.
+    if default:
+        parts = sorted(p for p in parts if p)
+    else:
+        parts = sorted(parts)
+    if not parts:
+        return ""
+    if len(parts) == 1 and (not parts[0] or parts[0] != default):
+        return parts[0]
+    return "[{}]".format("|".join(p for p in parts if p))
 
 
 def _sk_sub(m):
@@ -191,17 +198,11 @@ def get_install_alias_names(aliases, friendly=True, windowed=True, default_platf
 
     result = []
     for k, (n1, n2, n3) in seen.items():
-        plat_parts = plats.get(k)
-        plat = _make_opt_part(plat_parts)
-        if default_platform and plat_parts == {default_platform}:
-            # The bare alias was already shown for another install, but the
-            # suffix is still optional when it matches the default platform.
-            plat = f"[{default_platform}]"
         result.append("".join([
             n1,
             _make_opt_part(has_w.get(k)),
             n2,
-            plat,
+            _make_opt_part(plats.get(k), default_platform),
             n3,
         ]))
     return sorted(result, key=_make_alias_name_sortkey)

diff --git a/src/manage/scriptutils.py b/src/manage/scriptutils.py
@@ -255,7 +255,7 @@ def _parse_shebang(cmd, line, *, windowed=None):
                             "'false' in your configuration file.")
             try:
                 return _find_on_path(cmd, full_cmd)
-            except LookupError as ex:
+            except LookupError:
                 LOGGER.error("Could not launch '%s'. Using default interpreter "
                              "instead.", full_cmd)
                 raise

diff --git a/tests/test_install_command.py b/tests/test_install_command.py
@@ -59,6 +59,7 @@ def test_print_cli_shortcuts(patched_installs, assert_log, monkeypatch, tmp_path
     class Cmd:
         scratch = {}
         global_dir = Path(tmp_path)
+        default_platform = "-64"
         def get_installs(self):
             return installs.get_installs(None)
 

diff --git a/tests/test_installs.py b/tests/test_installs.py
@@ -147,6 +147,9 @@ def test_install_alias_opt_part():
     assert "" == installs._make_opt_part([])
     assert "x" == installs._make_opt_part(["x"])
     assert "[x]" == installs._make_opt_part(["x", ""])
+    assert "[x]" == installs._make_opt_part(["x"], default="x")
+    assert "[x]" == installs._make_opt_part(["x", ""], default="x")
+    assert "y" == installs._make_opt_part(["y", ""], default="x")
     assert "[x|y]" == installs._make_opt_part(["", "y", "x"])
 
 
@@ -155,5 +158,5 @@ def test_install_alias_names():
     input.extend([{"name": i, "windowed": 1} for i in ["xy3.exe", "XY3-64.exe", "XYW3.exe", "xyw3-64.exe"]])
     expect = ["py[w]3[-64].exe"]
     expectw = ["py[w]3[-64].exe", "xy[w]3[-64].exe"]
-    assert expect == installs.get_install_alias_names(input, friendly=True, windowed=False)
-    assert expectw == installs.get_install_alias_names(input, friendly=True, windowed=True)
+    assert expect == installs.get_install_alias_names(input, friendly=True, windowed=False, default_platform="-64")
+    assert expectw == installs.get_install_alias_names(input, friendly=True, windowed=True, default_platform="-64")
diff --git a/tests/test_list.py b/tests/test_list.py
@@ -177,7 +177,7 @@ def online_install(tag, plat):
     ])
     assert_log(
         (r"!B!Tag\s+Name\s+Managed By\s+Version\s+Alias\s*!W!", ()),
-        (r"3\.15-dev-32.*" + re.escape("python[w]3[-32].exe, python[w]3.15[-32].exe"), ()),
+        (r"3\.15-dev-32.*" + re.escape("python[w]3-32.exe, python[w]3.15-32.exe"), ()),
         (r"3\.15-dev\[-64\].*" + re.escape("python[w]3[-64].exe, python[w]3.15[-64].exe"), ()),
         (r"3\.15-dev-arm64.*" + re.escape("python[w]3-arm64.exe, python[w]3.15-arm64.exe"), ()),
     )