Update manager/troubleshooting.mdx

Co-Authored-By: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

manager/troubleshooting.mdx

@@ -104,6 +104,14 @@ If you want to specify a different path instead of `~/.tmp/default`, run `python
 
 ## Security policy
 
+If you encounter the error `This action is not allowed with this security level configuration` when installing custom nodes via git URL or using the nightly version, you need to adjust the security level in your `config.ini` file.
+
+The `config.ini` file is located at:
+- **ComfyUI v0.3.76+**: `<USER_DIRECTORY>/__manager/config.ini`
+- **Older versions**: `<USER_DIRECTORY>/default/ComfyUI-Manager/config.ini`
+
+Where `<USER_DIRECTORY>` defaults to `ComfyUI/user`. See [Configuration](/manager/configuration) for more details.
+
 Configure security levels in `config.ini`:
 
 ```ini
@@ -125,6 +133,10 @@ security_level = normal
 | **Middle** | Uninstall/Update, installation of custom nodes in default channel, restore/remove snapshot, restart |
 | **Low** | Update ComfyUI |
 
+<Tip>
+To install custom nodes via git URL or nightly versions, set `security_level = weak` in your `config.ini`.
+</Tip>
+
 ## Getting help
 
 If you're still experiencing issues: