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 plugi
My system was 32 bit. I removed and re-installed Notepad++. After that from below got PluginManager_v1.4.12_UNI.zip and extracted it.
https://github.com/bruderstein/nppPluginManager/releases
I created a folder called PluginManager at C:\Program Files (x86)\Notepad++\plugins\ and copied PluginManager.dll into it. I restarted my notepad++ and now I see Plugin Manager.