I remember having the same problem, but then it somehow went away. I know that isn’t very helpful, but I can share the code I found in my notebook I was working in at the time:
base_dir = '.'
zipfile = base_dir + "/wikiart.zip"
#!wget http://web.fsktm.um.edu.my/~cschan/source/ICIP2017/wikiart.zip -O "{zipfile}" -c
#!unzip -n "{zipfile}" -d "{base_dir}"
csvzipfile = base_dir + "/wikiart_csv.zip"
#!wget http://web.fsktm.um.edu.my/~cschan/source/ICIP2017/wikiart_csv.zip -O "{csvzipfile}" -c
#!unzip "{csvzipfile}" -d "{base_dir}"
The commented parts are the lines I only run once, so you need to uncomment them. You might also need to update the URLs (I’m not sure if they are correct).