Site of promotion
To get 50 GB per month for 1 year, follow these steps:
Go to Windscribe

Create a new free account by choosing Have a Voucher?
and specifying the Voucher Code: KOMPUTER
Or use an existing account to enter the Voucher Code in the Account Status menu > Request a Voucher . Download and install Windscribe VPN using your account details. Windscribe
Terms of the offer :
The subscription includes 50 GB of traffic per month for free for 1 year. Additional traffic is not added to other bonus promotions. Only standard 10 GB, 20 GB or 30 GB can be expanded.
Available for installation on an unlimited number of devices. You can install a VPN application for Windows, Mac, Linux, Android and iPhone, use extensions for Google Chrome, Firefox, Opera.
Updates of applications to new versions are available.
You get free technical support.