I found the reason. I had CF DEV VM running on my machine. When I had quit it showed me progress of downloading being done.
Validating release 'bosh'... Finished (00:00:00)
Downloading release 'bosh-virtualbox-cpi'... Finished (00:02:39)
Validating release 'bosh-virtualbox-cpi'... Finished (00:00:01)
Downloading release 'bosh-warden-cpi'...