This SINEX was gzipped and then split into 1GB chunks to alleviate the download
process. To restore the original file, one can simply use the commands

cat ITSG-Grace2018s_normalEquation.snx.gz.part* > ITSG-Grace2018s_normalEquation.snx.gz

on Linux/Unix or

type ITSG-Grace2018s_normalEquation.snx.gz.part* > ITSG-Grace2018s_normalEquation.snx.gz

on Windows.

The resulting file can then be gunzipped (Warning: the resulting ASCII file
will become quite large).