Yay! I've rebuilt this workflow from scratch! I now uses bundled binaries from all the different optimization libraries, all orchestrated by the image_optim library, which is great, since it now longer depends on having ImageOptim, ImageAlpha and more importantly JPEGmini installed! I'll update packal when possible, but right now you can check it out and download it from github: https://github.com/ramiroaraujo/alfred-image-optim-workflow