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These steps are only for the Mage2.PRO extensions from the code.dmitry-fedyuk.com repository, and should be completed on the Step 2 of the generic installation instruction.
You do not need these steps for the extensions from the mage2pro GitHub repository.
Step 2.1
Buy an extension: https://mage2.pro/c/extensions
Step 2.2
You will be granted an access to the the code.dmitry-fedyuk.com repository.
It is a manual process now, so please wait until I will see and process your payment.
Step 2.3
Setup your account in the code.dmitry-fedyuk.com repository.
Step 2.4
Register your SSH key in your code.dmitry-fedyuk.com repository account
You can use your common SSH key or create a dedicated SSH key for the code.dmitry-fedyuk.com repository.
Step 2.5
Declare the code.dmitry-fedyuk.com repository to the Composer
Step 2.6
Make sure your have Git installed (e.g. type the git command), and install it if it is absent.
Step 2.7
Make sure your have an SSH client installed (e.g. type the ssh command), and install it if it is absent.
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The special installation steps are completed.
Now proceed with the Step 3 of the generic installation instruction.