Before using plugin NOTE plugins are usually in notepad 32 bit , 32 bit plugin is not compatible with 64 bit and vice versa(Recommendation use Notepad++ 32 bit)
Using Import in Notepad++
I tried Import plugin : https://stackoverflow.com/a/54873143/3266623
However it didnt worked for me
Manual way
1. Download and extract .zip file having all .dll plugin files under the path
C:\ProgramData\Notepad++\plugins\
To download use following link or google the same
http://docs.notepad-plus-plus.org/index.php/Plugin_Central
2. For placing inside plugins - Make sure to create a separated folder for each plugin
\plugins
+ DSpellCheck
+ MIME Tools
+ Converter (etc.)
3. (if plugin contains ext_libs folder) Copy ext_libs to the root notepad folder,Usually contains few ddl files i.e.
C:\Program Files (x86)\Notepad++