In order to install new Packages in Sublime Text Editor you need to make use of the Package Control, to open Package Control, press Ctrl + Shift + P keys on Windows or Command + Shift + P if you are using Mac.
Now type "Install Package" and press enter. It may take a while to refresh the repositories and you should see and Text Field again where you can search for the packages you want to Install.

Sublime Package Control - Install Package
Check out an Example of how to install a package:
Sublime - Installing Word Count Package
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