Below steps will help you to print 15 reports at once.
Step 1. Download reports in folder by clicking the “Download Reports” Tab as highlighted in below picture.
Step 2. Select only 15 reports from the folder you just downloaded , by clicking “ctrl” key and select up to 15 reports (as windows only allow one to print 15 reports at once).
Step3. Right click any file and click on “Print”.
It will start printing all 15 records from the printer that is set up in your windows PC.