How to install Duplicati on Synology / DSM

How-To
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DS418play (DSM 6.2.1-23824 update 2) … Installed mono (4.6.2-0096 ) and Duplicati (2.0.4.5) and Duplicati won’t run. Tried to launch using package icon and all I get is “connection to the server is lost”.

Suggestions?