You are right. The file Wolfram/cask_analysis.wls downloads it in line 38
Import[".../data/cask_types.csv", "CSV"]
If you prefer not to run the wls file you can use:
url = StringDelete[
"https://raw.githubusercontent.com/mthiel74/whisky-ultrametric-phyl\
ogenetics
/main/data/cask_types.csv", WhitespaceCharacter];
resp = URLRead[HTTPRequest[url], TimeConstraint -> 30];
caskData = ImportString[resp["Body"], "CSV"];
I hope this helps.
Marco
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