$ sudo apt-get update
$ sudo apt-get install nsis-pluginapi 

nsis-pluginapi is installed in your system.

Make ensure the nsis-pluginapi package were installed using the commands given below,

$ sudo dpkg-query -l | grep nsis-pluginapi *

You will get with nsis-pluginapi package name, version, architecture and description in a table

nsis-pluginapi package basic information: