Update manual inst

README.md

@@ -114,11 +114,21 @@ A note overview is created based on the defined search and the specified fields.
 
 ### Manual
 
+#### Manual via file system
+
 - Download the latest released JPL package (`io.github.jackgruber.note-overview.jpl`) from [here](https://github.com/JackGruber/joplin-plugin-note-overview/releases/latest)
 - Close Joplin
 - Copy the downloaded JPL package in your profile `plugins` folder
 - Start Joplin
 
+#### Manual via file via GUI
+
+- Download the latest released JPL package (`io.github.jackgruber.notelistpreview.jpl`) from [here](https://github.com/JackGruber/joplin-plugin-notelistpreview/releases/latest)
+- Go to `Tools > Options > Plugins`
+- Click on the gear wheel and select `Install from file`
+- Select the downloaded JPL file
+- Restart Joplin
+
 ## Usage
 
 Create one or more notes with the following content: