To be honest, we don't even know whether it even works. However, this version is maintained and we will be happy to accept your bugreports "in our bug-tracker":https://github.com/openvk/openvk/projects/1. You should also be able to submit them using "ticketing system":https://openvk.su/support?act=new (you will need an OVK account for this).
However, OVK makes use of Chandler Application Server. This software requires extensions, that may not be provided by your hosting provider (namely, sodium and yaml. this extensions are available on most of ISPManager hostings).
Simply put, we would recommend you to use latest CentOS (running on your own VDS/Dedicated) with latest PHP from EPEL. We used to have this configuration on our "main instance":https://openvk.su/ and thus will be able to provide quicker support for OVK running in this environment.
"samukhin":https://github.com/samukhin is working on a Docker container that contains a microblog version of OpenVK, see "#76":https://github.com/openvk/openvk/pull/76 for details. (Experimental)
You are encouraged to do so. We don't enforce this though. You can keep your sources to yourself (unless you distribute your OpenVK distro to other people).
You also not required to publish source texts of your themepacks and plugins.
*Attention*: bug tracker and telegram chat are public places. And ticketing system is being served by volunteers. If you need to report something, that shouldn't be immediately disclosed to general public (for instance, vulnerability report), *please use contact us directly*: