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To register and activate with PolyMath:
- Go to https://www.polymathplus.org/login.php
- Click Register and fill out the form.
- You will get an email confirmation giving you a password.
- Go back to https://www.polymathplus.org/login.php and log in with provided information (leave options as default).

In order to activate your PolyMath license, click "profile" on the left and then click Claim Site License (shown below)

Enter this Activation key -
X0008D74C4