The only thing you can do is to find a similar font, install that in your machine and re-type the "4" in the same color and position. Not exactly the same but dig in a little deeper you can probably find a closer one: https://www.behance.net/gallery/42210505/NOELAN-FREE-FONT
With a bit more in-depth AI knowledge you could actually draw the "4" by hand, it would only take a few minutes if its really that important.