So you've just spent a few hours waiting for Unreal to compile; if you haven't done that, you can do it here. You go to launch it, and you're faced with this message thanks to Vulkan:
You're seeing this because you don't have Vulkan installed, or your device is, like mine, too old to support it.
Unreal has behaved this way for a couple of versions now however Epic have kindly left us a launch argument to launch it using OpenGL.
So you may be asking: "What is this argument?". Well it's this one:
That's it! Just one, simple, argument.
There is a problem, however, if you're using Unreal Engine 4.25 or above, you'll get another error.
This only seems to be a thing in 4.25 as Epic has started deprecating OpenGL, good news though! It can still be re-enabled! However, I'm going to leave that for the next post, to keep things neat and tidy. You can find that post here.