Fixed: Removed .Net update notice on Windows LTSB 2015

src/NzbDrone.Core.Test/HealthCheck/Checks/DotnetVersionCheckFixture.cs

@@ -53,5 +53,17 @@ namespace NzbDrone.Core.Test.HealthCheck.Checks
 
             Subject.Check().ShouldBeError();
         }
+
+        [Test]
+        public void should_return_ok_for_net462_on_Win1511()
+        {
+            Mocker.GetMock<IOsInfo>()
+                  .SetupGet(v => v.Version)
+                  .Returns("10.0.14392");
+
+            GivenOutput("4.6.2");
+
+            Subject.Check().ShouldBeOk();
+        }
     }
 }

src/NzbDrone.Core/HealthCheck/Checks/DotnetVersionCheck.cs

@@ -7,11 +7,13 @@ namespace NzbDrone.Core.HealthCheck.Checks
     public class DotnetVersionCheck : HealthCheckBase
     {
         private readonly IPlatformInfo _platformInfo;
+        private readonly IOsInfo _osInfo;
         private readonly Logger _logger;
 
-        public DotnetVersionCheck(IPlatformInfo platformInfo, Logger logger)
+        public DotnetVersionCheck(IPlatformInfo platformInfo, IOsInfo osInfo, Logger logger)
         {
             _platformInfo = platformInfo;
+            _osInfo = osInfo;
             _logger = logger;
         }
 
@@ -26,6 +28,12 @@ namespace NzbDrone.Core.HealthCheck.Checks
 
             // Target .Net version, which would allow us to increase our target framework
             var targetVersion = new Version("4.7.2");
+            if (Version.TryParse(_osInfo.Version, out var osVersion) && osVersion < new Version("10.0.14393"))
+            {
+                // Windows 10 LTSB 1511 and before do not support 4.7.x
+                targetVersion = new Version("4.6.2");
+            }
+
             if (dotnetVersion >= targetVersion)
             {
                 _logger.Debug("Dotnet version is {0} or better: {1}", targetVersion, dotnetVersion);