Players from the launcher
Your server is in the CraftRank Launcher as soon as it is listed here: same ranking, same votes, same icon and version. There is nothing to install on your server. If you are not listed yet, see Add your server.
Which version they join with
The launcher starts the version the player picked. Support several versions (for example with ViaVersion) so nobody gets “Outdated client”.
Premium-only servers
Launcher players play with a username, not a Microsoft account. They can join servers that accept non-premium players. On a server with online-mode=true they see “Failed to verify username”. Such servers are shown in the launcher with the rest, but those players need the official launcher.
Votes and rewards
The Vote button in the launcher opens your normal vote page, so votes count the same and Votifier rewards work as usual. See How voting works.
Skins and capes
Players signed in with a CraftRank account show their CraftRank skin and cape to other launcher players on your server, in every version. No plugin or mod is needed on your side.