diff --git a/setup/install.py b/setup/install.py
index 2afcb58750..38930b5595 100644
--- a/setup/install.py
+++ b/setup/install.py
@@ -360,7 +360,8 @@ class Bootstrap(Command):
     def add_options(self, parser):
         parser.add_option('--ephemeral', default=False, action='store_true',
             help='Do not download all history for the translations. Speeds up first time download but subsequent downloads will be slower.')
-        parser.add_option('--path-to-translations', help='Path to sources of translations')
+        parser.add_option('--path-to-translations',
+                          help='Path to existing out-of-tree translations checkout. Use this to avoid downloading translations at all.')
 
     def pre_sub_commands(self, opts):
         tdir = self.j(self.d(self.SRC), 'translations')
@@ -373,12 +374,12 @@ class Bootstrap(Command):
             # Change permissions for the top-level folder
             os.chmod(tdir, 0o755)
             for root, dirs, files in os.walk(tdir):
-              # set perms on sub-directories  
-              for momo in dirs:
-                os.chmod(os.path.join(root, momo), 0o755)
-              # set perms on files
-              for momo in files:
-                os.chmod(os.path.join(root, momo), 0o644)
+                # set perms on sub-directories
+                for momo in dirs:
+                    os.chmod(os.path.join(root, momo), 0o755)
+                # set perms on files
+                for momo in files:
+                    os.chmod(os.path.join(root, momo), 0o644)
 
         elif opts.ephemeral:
             if os.path.exists(tdir):
diff --git a/setup/iso_codes.py b/setup/iso_codes.py
index 114fc5f832..f9ebbdef88 100644
--- a/setup/iso_codes.py
+++ b/setup/iso_codes.py
@@ -2,24 +2,24 @@
 # License: GPLv3 Copyright: 2023, Kovid Goyal <kovid at kovidgoyal.net>
 
 import fnmatch
+import optparse
 import os
 import shutil
 import time
 import zipfile
+from contextlib import suppress
 from io import BytesIO
 
-from setup import download_securely, Command
+from setup import Command, download_securely
 
 
 class ISOData(Command):
-    description = 'Get iso-codes data'
-    URL = f'https://salsa.debian.org/iso-codes-team/iso-codes/-/archive/main/iso-codes-main.zip'
+    description = 'Get ISO codes name localization data'
+    URL = 'https://salsa.debian.org/iso-codes-team/iso-codes/-/archive/main/iso-codes-main.zip'
 
     def add_options(self, parser):
-        if self.option_added:
-            return
-        parser.add_option('--path-to-isocodes', help='Path to iso-codes.zip')
-        self.option_added = True
+        with suppress(optparse.OptionConflictError):  # ignore if option already added
+            parser.add_option('--path-to-isocodes', help='Path to previously downloaded iso-codes-main.zip')
 
     def run(self, opts):
         if self._zip_data is None:
@@ -37,7 +37,6 @@ class ISOData(Command):
         super().__init__()
         self._zip_data = None
         self.top_level = 'iso-codes-main'
-        self.option_added = False
 
     @property
     def zip_data(self):
diff --git a/setup/resources.py b/setup/resources.py
index 5507779684..62af4882ed 100644
--- a/setup/resources.py
+++ b/setup/resources.py
@@ -142,7 +142,7 @@ class CACerts(Command):  # {{{
     CA_PATH = os.path.join(Command.RESOURCES, 'mozilla-ca-certs.pem')
 
     def add_options(self, parser):
-        parser.add_option('--path-to-cacerts', help='Path to mozilla-ca-certs.pem')
+        parser.add_option('--path-to-cacerts', help='Path to previously downloaded mozilla-ca-certs.pem')
 
     def run(self, opts):
         if opts.path_to_cacerts:
@@ -177,7 +177,7 @@ class RecentUAs(Command):  # {{{
     UA_PATH = os.path.join(Command.RESOURCES, 'user-agent-data.json')
 
     def add_options(self, parser):
-        parser.add_option('--path-to-user-agent-data', help='Path to user-agent-data.json')
+        parser.add_option('--path-to-user-agent-data', help='Path to previously downloaded user-agent-data.json')
 
     def run(self, opts):
         from setup.browser_data import get_data