Ok I think I found what happened, in ZLInstallerLog.log I see this, it matches exactly when zenno stopped working because of "Update License":
6:27:50: 2160: : -------------- Update License is running :2160 --------------------------------
6:27:51: 2160: : Check product registration: "SOFTWARE\ZennoLab\EN\ZennoPoster Pro\5.11.3.0"
6:27:53: 2160: : FillServersPings begin
6:27:53: 2160: Error : GetPing problem (
https://userarea.zennolab.com/): An exception occurred during a Ping request. | at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options) | at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress) | at SupportLib.WebServiceFunctions.LoPitvFuE4ex1obrxTo(Object , Object ) | at SupportLib.WebServiceFunctions.r2p2p37YfX(String )
6:27:53: 2160: : FillServersPings:
https://userarea.zennolab.com/ ping 9223372036854775807
6:27:53: 2160: Error : GetPing problem (
https://userarea-us.zennolab.com/): An exception occurred during a Ping request. | at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options) | at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress) | at SupportLib.WebServiceFunctions.LoPitvFuE4ex1obrxTo(Object , Object ) | at SupportLib.WebServiceFunctions.r2p2p37YfX(String )
6:27:53: 2160: : FillServersPings:
https://userarea-us.zennolab.com/ ping 9223372036854775807
6:27:53: 2160: Error : GetPing problem (
https://userarea-hk.zennolab.com/): An exception occurred during a Ping request. | at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options) | at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress) | at SupportLib.WebServiceFunctions.LoPitvFuE4ex1obrxTo(Object , Object ) | at SupportLib.WebServiceFunctions.r2p2p37YfX(String )
6:27:53: 2160: : FillServersPings:
https://userarea-hk.zennolab.com/ ping 9223372036854775807
6:27:53: 2160: : FillServersPings:
https://userarea.zennolab.com/ is not available
6:27:53: 2160: : FillServersPings: FastPingServer was not found
6:27:53: 2160: : FillServersPings end
6:27:54: 2160: Warning : Node
https://userarea-us.zennolab.com/ not available: System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize ---> System.Configuration.ConfigurationErrorsException: Unrecognized configuration section system.serviceModel. (C:\Program Files (x86)\ZennoLab\EN\ZennoPoster Pro\5.11.3.0\uninstall\Installer.exe.Config line

| at System.Configuration.ConfigurationSchemaErrors.ThrowIfErrors(Boolean ignoreLocal) | at System.Configuration.BaseConfigurationRecord.ThrowIfInitErrors() | at System.Configuration.ClientConfigurationSystem.EnsureInit(String configKey) | --- End of inner exception stack trace --- | at System.Configuration.ConfigurationManager.GetSection(String sectionName) | at System.Configuration.PrivilegedConfigurationManager.GetSection(String sectionName) | at System.Net.Configuration.WebRequestModulesSectionInternal.GetSection() | at System.Net.WebRequest.get_PrefixList() | at System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase) | at SupportLib.WebServiceFunctions.qj4aPmftTq(Queue`1 )
6:27:54: 2160: Warning : Node
https://userarea.zennolab.com/ not available: System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize ---> System.Configuration.ConfigurationErrorsException: Unrecognized configuration section system.serviceModel. (C:\Program Files (x86)\ZennoLab\EN\ZennoPoster Pro\5.11.3.0\uninstall\Installer.exe.Config line

| at System.Configuration.ConfigurationSchemaErrors.ThrowIfErrors(Boolean ignoreLocal) | at System.Configuration.BaseConfigurationRecord.ThrowIfInitErrors() | at System.Configuration.ClientConfigurationSystem.EnsureInit(String configKey) | --- End of inner exception stack trace --- | at System.Configuration.ConfigurationManager.GetSection(String sectionName) | at System.Configuration.PrivilegedConfigurationManager.GetSection(String sectionName) | at System.Net.Configuration.WebRequestModulesSectionInternal.GetSection() | at System.Net.WebRequest.get_PrefixList() | at System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase) | at SupportLib.WebServiceFunctions.qj4aPmftTq(Queue`1 )
6:27:54: 2160: Error : Failed to initialize web services: Error getting available url | at SupportLib.WebServiceFunctions.Init(String localization)
6:27:54: 2160: Error : FAIL:Web service error (IsUserExists): Invalid URI: The format of the URI could not be determined. | at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) | at System.Net.WebRequest.Create(String requestUriString) | at SupportLib.WebServiceFunctions.I4AaEhSLi8(String , String , Boolean& ) | at SupportLib.WebServiceFunctions.IsUserExists(String login, String password)
6:27:54: 2160: Error : Server UnknownError: Web service error (IsUserExists)
6:28:59: 10732: : -------------- Update License is running :10732 --------------------------------
6:29:00: 10732: : Check product registration: "SOFTWARE\ZennoLab\EN\ZennoPoster Pro\5.11.3.0"
6:29:01: 10732: Warning : UpdateLicenses can be run again after 06:29:53
6:29:01: 10732: : Exit
6:29:01: 10732: : -------------- Update License finished : 10732 --------------------------------
10:34:43: 2160: Error : FAIL:Web service error (IsUserExists): Invalid URI: The format of the URI could not be determined. | at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) | at System.Net.WebRequest.Create(String requestUriString) | at SupportLib.WebServiceFunctions.I4AaEhSLi8(String , String , Boolean& ) | at SupportLib.WebServiceFunctions.IsUserExists(String login, String password)
10:34:43: 2160: Error : Server UnknownError: Web service error (IsUserExists)
10:34:44: 2160: Error : FAIL:Web service error (IsUserExists): Invalid URI: The format of the URI could not be determined. | at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) | at System.Net.WebRequest.Create(String requestUriString) | at SupportLib.WebServiceFunctions.I4AaEhSLi8(String , String , Boolean& ) | at SupportLib.WebServiceFunctions.IsUserExists(String login, String password)
10:34:44: 2160: Error : Server UnknownError: Web service error (IsUserExists)
10:34:45: 2160: Error : FAIL:Web service error (IsUserExists): Invalid URI: The format of the URI could not be determined. | at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) | at System.Net.WebRequest.Create(String requestUriString) | at SupportLib.WebServiceFunctions.I4AaEhSLi8(String , String , Boolean& ) | at SupportLib.WebServiceFunctions.IsUserExists(String login, String password)
10:34:45: 2160: Error : Server UnknownError: Web service error (IsUserExists)
10:34:45: 2160: Error : FAIL:Web service error (IsUserExists): Invalid URI: The format of the URI could not be determined. | at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) | at System.Net.WebRequest.Create(String requestUriString) | at SupportLib.WebServiceFunctions.I4AaEhSLi8(String , String , Boolean& ) | at SupportLib.WebServiceFunctions.IsUserExists(String login, String password)
10:34:45: 2160: Error : Server UnknownError: Web service error (IsUserExists)
10:34:46: 2160: Error : FAIL:Web service error (IsUserExists): Invalid URI: The format of the URI could not be determined. | at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) | at System.Net.WebRequest.Create(String requestUriString) | at SupportLib.WebServiceFunctions.I4AaEhSLi8(String , String , Boolean& ) | at SupportLib.WebServiceFunctions.IsUserExists(String login, String password)
10:34:46: 2160: Error : Server UnknownError: Web service error (IsUserExists)
10:34:47: 2160: : -------------- Update License finished : 2160 --------------------------------
At 10:34 I clicked on the cancel button...