A v1.2 version is in the works right now, and I will be making an updated tutorial about how to use all of these new features in both 1.1 and 1.2 once it is released.
You can purchase EasyMapper here: https://www.unrealengine.com/marketplace/en-US/profile/William+Faucher

EasyMapper v1.1 Release:

Puddle support: Now you can use the Blue Channel of your vertex painting to add puddles to your surfaces. You’ll also get the ability to control small waves/ripples in the puddle, and opacity/falloff/wetness controls. If you want a more convincing blend, you can use the Blend options, which can be a bit finicky to set up, but will provide a greater level of control and accuracy in regards to where the puddles accumulate. The reason this blend method is a bit trickier to set up, is because the puddles take the displacement of the materials below it into account. Since everyone will want to displace each material below the puddles differently, it is impossible to have «magic settings» that work in every situation.
Virtual Texture Support: EasyMapper now comes with two Master Materials. One default one for non-VT textures (If your project doesn’t use Virtual Texturing), and a new _VT version, for those of you who need it. Personally, I recommend using the VT version, as it is easier on the GPU come render time.
Non-ARD Texture Support: By default, EasyMapper used packed textures for the AmbientOcclusion, Roughness, and Displacement slots, in the R, G and B channels respectively. This is the approach megascans uses for their materials when you use Quixel Bridge. However, since not everyone uses, or wants to use packed textures, I have included the opportunity to disable ARD, and use individual, non-packed textures for Ambient Occlusion, Roughness, and Displacement respectively.