I had the same problem as in the post Orchestrator CE Issue - Failed to install Package
The solutions described in the post did not lead to results.
Error in event viewer client pc:
NU1101: Unable to find package EDK_cert_downloader. No packages exist with this id in source(s): Go!, servername/nuget/activities, servername/nuget/feed/default, Local, nuget.org, Official
Warning in event viewer orchestrator server pc:
Current user did not login to the application! Abp.Authorization.AbpAuthorizationException: Current user did not login to the application!
at async Task UiPath.Web.Common.Authorization.UiAuthorizationHelper.AuthorizeAsync(IEnumerable authorizeAttributes)
at async Task Abp.Authorization.AuthorizationHelper.CheckPermissions(MethodInfo methodInfo, Type type)
at async Task UiPath.Web.Common.Authorization.UiAuthorizationHelper.AuthorizeAsync(MethodInfo methodInfo, Type type)
at async Task UiPath.Web.Common.Authorization.UiApiAuthorizeFilter.ExecuteAuthorizationFilterAsync(HttpActionContext actionContext, CancellationToken cancellationToken, Func<Task> continuation)