Get Access Keys:

Create an account on Magento marketplace and go to https://marketplace.magento.com/customer/accessKeys/ to get private and public access key,

Create Access keys here. If you have access keys, you can use those.

Now enter Username  and password to start downloading

• Username: Your public Key  2fc966a913d4e83b28041eeb3c3b72e5
• Password: Your private key. 48e05400d17ca1bcb4e693825c45416e

Use Your Access Keys in your project.