Thank you! This tip may just be the cure. But I shouldn't need to know this, pip should have taken care of picking the best download mirror. Or it could just

Thank you! This tip may just be the cure. But I shouldn't need to know this, pip should have taken care of picking the best download mirror. Or it could just support resuming a previous download. I don't actually mind waiting for a slow download or having to rerun pip install a few times, as long as it makes progress each time I run it.