I downloaded Notepad++ from https://notepad-plus-plus.org/repository/7.x/7.5.1/npp.7.5.1.Installer.x64.exe.
And I installed the same. Now I need to install few plugins, but in the menu option Plugins there are only Converter and MIME tools listed, but not Plugin Manager.
Edit: They have removed Plugin Manager with the version 7.5. Still it can be added by following @johnny 's instruction in the best solution.
P.S: The plugin manager is only supporting the 32-bit version.
Best Answer
As of Notepad++ version 7.5, plugin manager is no longer shipped with Notepad++
From the Notepad++ release notes:
If the above doesn't put you off, and you want to proceed and install the plugin manager anyway, it looks like there's a GitHub repository for nppPluginManager - though I haven't personally used it, so cannot comment on it's validity.
The nppPluginManager installation instructions state:
The GitHub repository also contains the latest release.