According to https://github.com/JuliaLang/julia/issues/31465 I should report such issues on discourse, so here we are…
I am not able to install Julia 1.2.0 on a freshly installed latest macOS Mojave (10.14.6) with a shiny new homebrew installation due to a checksum error:
> brew cask install julia
Updating Homebrew...
==> Satisfying dependencies
==> Downloading https://julialang-s3.julialang.org/bin/mac/x64/1.2/julia-1.2.0-mac64.dmg
######################################################################## 100.0%
==> Verifying SHA-256 checksum for Cask 'julia'.
==> Note: Running `brew update` may fix SHA-256 checksum errors.
Error: Checksum for Cask 'julia' does not match.
Expected: 7a27780d3b791032b788aa0d411aee117cb3cd602ea76ba6514468e4459bca0e
Actual: c65f3af899571ba8f100f55339a0251a31342c25f33fc500929fd7404ec8e955
File: /Users/tamasgal/Library/Caches/Homebrew/downloads/59856574add569ae4528f6c6b05956f54afd437bda9e98c68ca9f81e50389de7--julia-1.2.0-mac64.dmg
To retry an incomplete download, remove the file above.
If the issue persists, visit:
https://github.com/Homebrew/homebrew-cask/blob/master/doc/reporting_bugs/checksum_does_not_match_error.md
I downloaded the image multiple times but it has the same checksum, so I assume the recipe has to be updated.