We have an ESET Protect Server connected to the internet that serves OFFLINE clients so the upgrade to ESET Endpoint Antivirus/Security 9.1.2051.0 has been done using an MSI delivered via GPO. All policies were working fine on previous version (2046) and we were doing updates via a mirror folder on the server. (Product updates must be done via GPO as we are airgapped).
I rolled out ESET Endpoint Antivirus/Security 9.1.2051.0 to a few clients and all were getting these errors (I can provide logs but not on forum):