The plugin installation is very simple, the same as with any other WordPress plugin. There are no special requirements for the plugin installation.
Direct Installation
DebugPress is available from the WordPress.org repository, and it can be installed directly from the WordPress website Plugins -> Add New page. Type ‘DebugPress’ in the search field, and once the plugin is found, you will install it directly from there, and activate it after that.
Install from the ZIP archive
If you have downloaded the plugin ZIP archive, you can again use the WordPress Plugins -> Add New page. But, now, use the Upload Plugin button, select the ZIP archive and upload it to be installed.