diff --git a/pythonlib/camoufox/__main__.py b/pythonlib/camoufox/__main__.py
index 173c39f..17ca3b0 100644
--- a/pythonlib/camoufox/__main__.py
+++ b/pythonlib/camoufox/__main__.py
@@ -200,14 +200,18 @@ def cli() -> None:
 
 
 @cli.command(name='sync')
-@click.option('--spoof-os', type=click.Choice(['mac', 'win', 'lin']), help='Spoof OS')
+@click.option('--spoof-os', type=click.Choice(['auto', 'mac', 'win', 'lin']), help='Spoof OS (auto = native)')
 @click.option(
-    '--spoof-arch', type=click.Choice(['x86_64', 'i686', 'arm64']), help='Spoof architecture'
+    '--spoof-arch', type=click.Choice(['auto', 'x86_64', 'i686', 'arm64']), help='Spoof architecture (auto = native)'
 )
 def sync(spoof_os, spoof_arch):
     """
     Sync available versions from remote repositories.
     """
+    if spoof_os == 'auto':
+        spoof_os = None
+    if spoof_arch == 'auto':
+        spoof_arch = None
     _do_sync(spoof_os=spoof_os, spoof_arch=spoof_arch)
 
 
diff --git a/pythonlib/camoufox/pkgman.py b/pythonlib/camoufox/pkgman.py
index 157355c..82f7aa6 100644
--- a/pythonlib/camoufox/pkgman.py
+++ b/pythonlib/camoufox/pkgman.py
@@ -608,6 +608,8 @@ def installed_verstr() -> str:
     from .multiversion import get_active_path
 
     active = get_active_path()
+    if active is None:
+        raise FileNotFoundError("No active version. Please run `camoufox fetch` to install.")
     return Version.from_path(active).full_string
 
 
diff --git a/pythonlib/camoufox/sync_api.py b/pythonlib/camoufox/sync_api.py
index fd42c21..664c302 100644
--- a/pythonlib/camoufox/sync_api.py
+++ b/pythonlib/camoufox/sync_api.py
@@ -10,6 +10,7 @@ from typing_extensions import Literal
 
 from camoufox.virtdisplay import VirtualDisplay
 
+from .exceptions import InvalidProxy
 from .utils import launch_options, sync_attach_vd
 
 
@@ -28,8 +29,8 @@ class Camoufox(PlaywrightContextManager):
         super().__enter__()
         try:
             self.browser = NewBrowser(self._playwright, **self.launch_options)
-        except camoufox.exceptions.InvalidProxy as e:
-            super().__exit__(camoufox.exceptions.InvalidProxy, e, None)
+        except InvalidProxy as e:
+            super().__exit__(InvalidProxy, e, None)
             raise
         return self.browser