Hi, sure owncloud is fairly simple to install manually - same as wordpress, 5 minutes install and you done, however I would not suggest to use owncloud (there are some internal issues as creator and few leading co-developers left project it self for some moral questions alongside with other issues). When I was running last time (version 7) I could not get android app working properly and web interface was bit funny with me too.
For true sync I would recommend seafile (https://www.seafile.com/en/home/ this is cross platform) - or simple ssh solution if you on linux / unix office. If you still want web interface - pydio is great (pydio.com) as well.
cs10 I think seafile is deb package, it would be great if you check your system repos - its maybe there already… pydio is php scrip which you would just install with databse …similar manner as wordpress.