You can download a .zip archive (2.7 Gb) with the raw 3D hdf4 data used for the prediction. The corona folder (inside) contains the 3D fields of density, temperature, velocity, magnetic field, and current.
The short README.txt and associated files inside the archive illustrate how to read the data into IDL. This includes normalization to physical units and interpolation of the fields to a common grid.
Some technical information about running the simulations can be found here. If you use or share this simulation data in your own work, we ask that you please reference our 2017 eclipse paper and credit the simulation to Predictive Science Inc.