From the BigStock email notification that the forms are ready:
Good news! Your electronic 2017 tax form is now available online to view, print and/or save to your personal computer.
Just access the Tax Center, log in and follow the instructions. You must be able to view and download Adobe PDF files on your computer. This tax form will be available for download until October 15, 2018. If you are also a Shutterstock Contributor, please note: For 2017, you will only receive one 1099, and it will be available via your Shutterstock account. The amount in Box 2 of this 1099 includes both your Bigstock and Shutterstock payments received in 2017. Log into your Shutterstock account to download the 1099.
If you wish to receive a paper copy of your tax form in addition to this electronic version, please send a request to firstname.lastname@example.org.
Thank you for contributing your work to Bigstock.
The Bigstock Team