Grumpy_Mike:
His display is common cathode so that circuit will not work for him.
Spiridusu:
The digits that I have are the ones in the link and the wiring is the one in the image.
The following is the structure of the 4-digit display unit downloaded from OP's delivered link image. To the best of my knowledge, there are 4 common anode 7-segment display devices whose identical cathode terminals are connected together to make form a multiplexed display unit. Therefore, the circuit of Post#16 should work without a little bit of doubt should the program logic is implemented correctly?