You use MiKTeX Package Manager (MPM) to install and remove packages.
The package manager can be run in two modes: batch and windowed.
MPM runs in batch mode if you specify command-line options
mpm(1) for a list of available command-line
To start the package manager in windowed mode, click→ → → ). You will see a window similar to this:
Select all wanted packages in the list view.
Click onto install the packages.
For example: you want to install the memoir package:
Locate and select the memoir package in the list view, e.g., type the key sequence M E M O I R.
You can now clickto install the package.
Sometimes you don't know the name of a package, but you know the
name of a file that belongs to the wanted package. In this case, enter
the file name information in the file name edit control. Note that
the file name information can include wildcard characters
For example: you need the file
musxflx.lua in the file name
The list view will be reduced to contain only the
musixtex package. Selecting
musixtex and pressing + will
install the package.