Open https://github.com/erpnext/foundation/blob/master/foundation/www/assets/img/setup/data-import%20
notice %20 at the end
and try
https://github.com/erpnext/foundation/blob/master/foundation/www/assets/img/setup/data-import
to see that it leads to 404
Naming issue resulted in that repo can not be checked out on windows due to bad path.