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The docoll windows client .zip file (-all version) includes cwrsync (4.0.5, the last FOSS licensed version).  The 0.7.6.1 version is is docoll_windows_client_all-0.7.6.1.zip.

Licences

Although cwrsync installs essentially FOSS software (rsync, Cygwin, OpenSSH, OpenSSL), the installer itself is not FOSS since version 4.0.5.  cwrsync's current licence page, including links to the component software licence pages, is here.

docoll is licensed under GPLv2 or later.