Wolfram Mathematica - registration - screenshots
Registration and installation
Go to: http://user.wolfram.com
Do not use diacritics in name and surname
Confirm verification ling sent to your email address
Go to the activation key request form:
* Choose appropriate department * Name your computer (machine name) * Choose MAthematica for Sites * Choose proper version
https://user.wolfram.com/portal/requestAK/74282da95e2c1316b6fb97b505b6db2ddc740560
Go to the User Portal
Go to the registration form
Enter obtained activation key