Fix some minor errors

comfy_cli/command/custom_nodes/command.py

@@ -610,7 +610,7 @@ def display_all_nodes():
 
 @app.command("registry-install", help="Install a node from the registry", hidden=True)
 @tracking.track_command("node")
-def install(node_id: str, version: Optional[str]):
+def install(node_id: str, version: Optional[str] = None):
   """
   Install a node from the registry.
   Args:
@@ -637,15 +637,20 @@ def install(node_id: str, version: Optional[str]):
     return
 
   # Download the node archive
-  local_filename = pathlib.Path(
-    f"./downloads/{node_id}-{node_version.version}.tar.gz"
-  )
+  custom_nodes_path = pathlib.Path(workspace_manager.workspace_path) / "custom_nodes"
+  node_specific_path = custom_nodes_path / node_id  # Subdirectory for the node
+  node_specific_path.mkdir(parents=True, exist_ok=True)  # Create the directory if it doesn't exist
+
+  local_filename = node_specific_path / f"{node_id}-{node_version.version}.zip"
   logging.debug(f'Start downloading the node {node_id} version {node_version.version} to {local_filename}')
   download_file(node_version.download_url, local_filename)
 
   # Extract the downloaded archive to the custom_node directory on the workspace.
-  custom_nodes_path = pathlib.Path(workspace_manager.workspace_path) / "custom_nodes"
   logging.debug(f'Start extracting the node {node_id} version {node_version.version} to {custom_nodes_path}')
-  extract_package_as_zip(local_filename, custom_nodes_path)
+  extract_package_as_zip(local_filename, node_specific_path)
+
+  # Delete the downloaded archive
+  logging.debug(f'Deleting the downloaded archive {local_filename}')
+  os.remove(local_filename)
 
   logging.info(f'Node {node_id} version {node_version.version} has been successfully installed.')