The current 3rth party repo is deprecated so I’ve created my own fork for version: 2.0.4-11112
sudo eopkg bi --ignore-safety https://raw.githubusercontent.com/L0g0ff/3rd-party/master/network/download/synology-drive-client/pspec.xml
sudo eopkg it synology-drive-client*.eopkg;sudo rm synology-drive-client*.eopkg
Have fun!