I managed to get the exact report required. In order to generate a statistical report of the number of downloads of a BlackBerry App from the online store, we can log in to our account (vendor account) and go to "Manage Reports". In it there is an option for "Schedule Reports". Inside "Schedule Reports", select the application for which you need the count of downloads and select a start date and end date. The report can be sorted by:
- Date only
- Product, then Date
- Carrier, then Date
- Country, then Date
- Device, then Date
The report is detailed and can easily be downloaded both from "Manage Reports" as well as "Download Reports". The .csv file can be viewed in excel and can later be saved in .xls format as well.