Step 1. From the Dashboard, click on Reports

Step 2. Under Reports, click on Sales on the left.

Step 3. In the field saying Date of Sale, select the period or a specific date range and click Submit.

Note: The same can be done through Manage Sales under Rewards

Step 4. Once search results are shown, at the end of the list, click on Download All from Search
 

Step 5. And then click on Go, the results will be exported as a .csv(Excel) file