when I try to upgrade to the enterprise version, I get the error "file_get_contents( …url… ):failed to open stream: HTTP request failed! HTTP/1.1 401 Unauthorized
API key+secret are ok.
Update URL: https://update.pydio.com/auth/
Release-channel “Install enterprise version”.
Curret Pydio version 8.0.2 (Ubuntu 16.04 LTS)
What can I try to resolve this problem?