When trying to connect to your KeyShot floating license and you get the error message that your KeyShot floating license server is too old it just means the LMGRD and vendor daemon LUXION files are outdated. To fix this issue you would just need to follow the steps below on your floating license server. 

Updating your Luxion License Server.
1. Download the server software for your computers OS.
    1. Windows Server.
    2. Macintosh Server.
    3. Linux Server.
2. Install the server Software
    1. The installer will remove and upgrade the old license server or prompt you          if an older installation has been found. 

Once you have Update your Luxion License Server with the current supported file it should resolve the issue with the error that your floating license server is too old.