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If you do not have access to the ECMWF hpc2020 file system, or if you wish to install the climatological input files in a local directory of your choice, then you can download the required data from this site: https://sites.ecmwf.int/openifs/openifs-data/ifsdata/48r1/

As a minimum you will require the packages ifsdata_rtables_48r1.tgz,  and ifsdata_climatology_48r1.tgz, and the files required . You will also need to download the package for your selected horizontal grid resolution, which in the case of our worked example on this page is for a T255 grid, and therefore you will at the very least need the package ifsdata_48r1_climate.v020_255.tgz. Installing the packages for all supported horizontal grids will require a lot of disk space and is therefore not recommended.

Download and extract the files in these tarballs into the same directory in your chosen location, and the filepath of this directory should then be set to variable OIFS_DATA_DIR.