After terrible experience with many errors and problems in ESET Remote Administrator Server version 6.1 we have got version 184.108.40.206 finally. It looks like it work like a charm.
Everything seems to be working:
Remote Agent install with no errors (from live agent installer)
Remote install of ESET Endpoint Antivirus clients working (We've got some problems with activation, but new task "Activate product" solves the issue )
Workstation are updates with virus database successfully
No errors in ERAC - just perfect
on all workstation we can see one, the same erro