The Budget Workflow App can be installed on any SharePoint 2013 installation that has the app infrastructure and workflows enabled. (Office 365 has this all handled for you out of the box). You will need Administrator permissions, and a familiarity with your company's organizational structure.
The Budget Workflow App is installed as an App from the Microsoft SharePoint Store: https://store.office.com/budget-workflow-WA104323053.aspx?assetid=WA104323053
3. At this point, all that remains is to configure the Budget Workflow App with it's custom functional areas and categories. A configuration wizard launches automatically, and will guide you through the process.