To download an e-Aadhaar, first click on the official website of Aadhaar
Select the option of 'Get Aadhaar' here
Here you will get an option above in which you will have to enter the 12-digit Aadhaar number
Apart from this, you can also fill Enrollment ID or Virtual ID
Enter the security code along with entering the Aadhaar number
Then click on Send OTP option
OTP will come on your Registered No, which should be entered on the website
Then click on the option of Verify and download
Download it and keep it for any reference