I was tring to donate for the download but my card dosen't support the payment method other than that bitcoin is something very new to me and i don't want to pay through bitcoin. Is there any other method of donating and downloding loki???
You could enter "0" on the homepage to start the download, and then visit Get Involved to find another way to contribute. On that page, you can contribute via PayPal or Patreon, or by buying something from the store. You can also contribute to elementary via Bountysource.