Download software tagged by black

Clouds were gathering over Europe. An unknown until now, the disease spread with the speed of a forest fire in all major cities. The plague doctors from the Black Raven Order sent their best fighter to one of the infected cities. There, according to

Software produces Aztec barcode that is versatile, square or rectangular grid of black and white cells with a bullseye pattern in the centre, determining its orientation and containing data around it, making it easy to read from any direction.