Quick and dirty:
1 - Create ubuntu(used 18.04) container with volume mounted to old repo folder and network(bridge) using host(synology) network.
2 - Update apt and install nakivo requirements (apt install cifs-utils ntfs-3g open-iscsi)
3 - Install nakivo (install, install again,remove, install ... )
4 - Check rights on mounted repo folder
5 - Should be running now :-)