Could you please clarify if you mean the self-hosted RU Server for Linux? If this is the case, then unfortunately, we do not provide RU Server or Host for Linux/Mac yet, but we plan to release these modules in the near future. Currently, only Viewer is available for Mac/Linux - you can download the Linux distributive on this page.
In addition, please note that RU Server does not require to be registered with a license key as well as Host, you only need to register your Viewer regardless of the license type. If you mean something else, please let us know.
Hello. Yes i mean self hosted Ru-server. I don't need license for Your software, but if i want to run own server to connect hosts i need license for operating system. I would prefer to run RU-server on linux whitch is free.