When installing LyX on Mac, one might experience the error “error converting to loadable format” when including pdf files. This is likely because of missing of ImageMagick. To fix the problem, you will need to install ImageMagick. To do it, the following steps need to follow.

1. Install Xcode from App store.
2. Once you have Xcode installed, open a terminal, run xcode-select –install, and click the Install button to install the required command line developer tools.
3. Download and install MacPorts: https://distfiles.macports.org/MacPorts/MacPorts-2.3.4-10.11-ElCapitan.pkg
4. Install ImageMagick using sudo port install ImageMagick in terminal