Main problem is prevalence of using os.path.join() to create URLs, on Windows this will use backslashes to join the arguments instead of forward slash, ending up with errors like

>>> import wfdb; import os; wfdb.dldatabasefiles('ltstdb', os.getcwd(), ['s20011.hea', 's20011.dat'], overwrite=True)
Downloading files...
multiprocessing.pool.RemoteTraceback:
... < SNIP > ...
requests.exceptions.HTTPError: 404 Client Error: Not Found for url: http://physionet.org/physiobank/database/ltstdb%5Cs20011.hea

(of course %5C is a backslash).

Probably want to use posixpath instead?

have solved this?
i have this problem now, and i check WFDB have use posixpath now ,but why still this happened?