Dear Irfan,
I would suggest that you opt for an offline installation package. This may work for you. Once you have the installer open, follow the directions on
this page.
The advantage with this method is that even if you can not access from that same machine, you can use the offline package manager to create a package on a USB stick which you can then install on any machine.
Hope this helps. But if you still have problems installing, please drop an email to
sup...@dgbes.com (don't forget to include the screenshots with error messages if you get any).
Best regards,
Victoria