What should I do if it doesn't get installed even after downloading the installation package from www.bluestacks.com?
Make sure you meet the hardware requirements met by bluestacks. If not try upgrading your hardware.
The first thing you have to do is to check if your computer meets the system requirements. You can check the online system requirements posted on the support page. After this procedure, visit the Bluestacks website and download a new package. Right click it and choose Run as Administrator. It will give the installer system access. Wait for installation to finish and the Bluestacks will start automatically afterwards.