The plugin manager was never an integral part of Notepad++, but always shipped as part of the standard installer. This changed as of version 7.5.
I only recently discovered this when installing Notepad++ on a newy rebuilt PC. I came to install the Compare plugin and couldn’t find the Plugin Manager entry on the Plugins menu:
I did some invesitgating and found that the plugin manager had been removed as it now contained an advert:
The develop of the Plugin Manager introduced the advert to support the hosting costs of the Plugin Manager.
|Plugin Manager Removed in Notepad++ 7.5|
|Install Plugin Manager|
|Adding Plugin When Plugin Manager Shows No Plugins|