Hello,   now our Sky Tools Free are available again. Version 1.21 working with X-Plane 10.42 or 10.45.... You can download them with our X-Plane 10 download area:   Registration in the Forum required.   For Version 1.21 we only have changed the shader. So if you have downloaded the Sky Tools v 1.20 you only can downlod the Shader-121-zip file. Extract it and repplace the file cloud_puffs.glsl in the Shaders folder of the Sky tools. Then you have V 1.