drush dl composer
drush dl libraries qtip_library
drush en qtip_library
Manually:
Download libraries and qtip_library; place them into your modules folder, e.g. sites/all/modules.
Download the qTip2 Javascript library, place it into your libraries folder, e.g. sites/all/libraries. Make sure the directory name of the extracted library is qtip.
Enable qTip Library.
Verify that the library has been installed correctly:
drush libraries-list
Name Status Version Variants Dependencies
qtip OK 2.0.0 source, basic, basic-source -