The ways to install the "Nested numbered lists for the block editor" plugin are described here.

In your WordPress dashboard Go to Plugins > Add New. Search for "Connector for Propstack." Click "Install" next to the plugin, then click "Activate." Manual installation Go to the official plugin website and click "Download." In your WordPress dashboard, go to Plugins > Add New and click the "Add Plugin" button. In the file dialog, select the file you downloaded in Step 1 and upload it. Then activate the plugin. Install via FTP Go to the official plugin website and click "Download." Then upload the ZIP file via FTP to the "/wp-content/plugins/„ directory. Activate the plugin via the “Plugins" menu in WordPress.

Connector for Propstack - WordPress Plugins by Thomas Zwirner

WordPress plugin

free of charge

Plugin page:

https://de.wordpress.org/plugins/connector-for-propstack/

Support forum: https://wordpress.org/support/plugin/connector-for-propstack/

GitHub repository: https://github.com/threadi/connector-for-propstack

Connector for Propstack

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Installation of „Connector for Propstack“