Could you post the output of running
using Pkg
Pkg.PlatformEngines.probe_platform_engines!(; verbose=true)
mktempdir() do dir
url = "https://github.com/JuliaComputing/PackageCompilerX.jl/releases/download/v0.1/x86_64-8.1.0-release-posix-seh-rt_v6-rev0.tar.gz"
Pkg.PlatformEngines.download(url, joinpath(dir, "test.tar.gz"); verbose=true)
end
(Taken from Julia 1.3.1 cannot automatically install - #4 by staticfloat)