Download New Emby
wget https://github.com/MediaBrowser/Emby.Releases/releases/download/4.5.2.0/emby-server-deb_4.5.2.0_amd64.deb

Install
dpkg -i emby-server-deb_4.5.2.0_amd64.deb

FTP Problems uploading
sudo chmod -R 777 /path/to/file