The links in this page are all wrong
http://devdocs.magento.com/guides/m1x/ce18-ee113/ht_magento-ce-sample.data.html
http://www.magentocommerce.com/downloads/assets/1.9.1.0/magento-sample-data-1.9.1.0.zip
the about links are redirect to another page and say what "You may have wandered, but you are not lost..."
I found that out too and found this link from another topic:
https://www.magentocommerce.com/download
You'll find the sample data packages there!
You can also download sample Magento1.9 data in below link :
https://github.com/Vinai/compressed-magento-sample-data
