This dataset depends on the following independent variable (i.e, grid):
grid: /S (months since 1960-01-01) ordered (0000 1 Jan 2019) to (0000 1 Jan 2021) by 1.0 N= 25 pts :grid
so there will be 25 links below for the different files.
You may want to get a utility like wget which can download sets of files. For example (all one line)
wget -r -l2 -nd --no-parent -e robots=off -v --relative 'http://45.183.221.150/SOURCES/.NextGen/.CPT/.1p0/.Guatemala/.GFDL-CM2p5-FLOR-A06/.Forecast/PredErrorVars/ngridtable/4+index/.target_length/1+index/2+index/7+index/.PredErrorVars/8+index/.PROBABILITIES/3+index/6+index/downloadsarcinfo.html'
single quotes are necessary in unix to protect the url from expansion; probably necessary in other cases as well