ERROR: Could not automagically symlink the prompt. Either:
1. Check out the readme on how to do it manually: github.com/sindresorhus/pure
2. Or add the following to your `.zshrc`:

    fpath+=('/home/ah/.npm-global/lib/node_modules/pure-prompt/functions')
+ pure-prompt@1.9.0
added 1 package from 1 contributor in 3.685s

Basically means:

1. The package was installed successfully
2. In order to use the tool from your command-line, you have to manually add its path to your zsh config file. Just do as it says in (2.):

add the following to your .zshrc:

fpath+=('/home/ah/.npm-global/lib/node_modules/pure-prompt/functions')

which you can do by issuing the following command:

$ echo "fpath+=('/home/ah/.npm-global/lib/node_modules/pure-prompt/functions')" >> ~/.zshrc

After that, restart the terminal or reload the profile:

$ . ~/.zshrc