What are the steps to reproduce your problem?

• complete the invoice showcase
• go to the history view and open the variable tab
• click on the invoice.pdf file to download it

What is the problem?
Error appears. The link behind the download points to the history data:
Current link:
http://localhost:8080/camunda/api/engine/engine/default/variable-instance/75294e86-dbab-11e5-b1e7-28d244730e4e/data
Expected link
http://localhost:8080/camunda/api/engine/engine/default/history/variable-instance/75294e86-dbab-11e5-b1e7-28d244730e4e/data