NOTE:These instructions only apply to Spree version 0.50.x.

1. Add the following line to your Gemfile

gem 'spree_advanced_calculators', :git => 'git://raw.github.com/niamtech/spree-advanced-calculators.git', :branch => 'master'

2. Update your bundle by running:

$ bundle install

3. Refer to the extensions READme for further instructions:

http://github.com/niamtech/spree-advanced-calculators