diff --git a/DEM.Net.Core/Services/DemProviders/OpenTopography/GDALVRTFileService.cs b/DEM.Net.Core/Services/DemProviders/OpenTopography/GDALVRTFileService.cs
index e8fddbad..c5d280b8 100644
--- a/DEM.Net.Core/Services/DemProviders/OpenTopography/GDALVRTFileService.cs
+++ b/DEM.Net.Core/Services/DemProviders/OpenTopography/GDALVRTFileService.cs
@@ -111,7 +111,7 @@ void IDEMDataSetIndex.Setup(DEMDataSet dataSet, string dataSetLocalDir)
                         {
                             _logger?.LogInformation($"Downloading index file from {dataSet.DataSource.IndexFilePath}... This file will be downloaded once and stored locally.");
 
-                            HttpClient client = _httpClientFactory.CreateClient();
+                            HttpClient client = _httpClientFactory == null ? new HttpClient() : _httpClientFactory.CreateClient();
 
                             using (HttpResponseMessage response = client.GetAsync(dataSet.DataSource.IndexFilePath).Result)
                             using (FileStream fs = new FileStream(vrtFileName, FileMode.Create, FileAccess.Write))
@@ -209,7 +209,7 @@ public void DownloadRasterFile(DemFileReport report, DEMDataSet dataset)
             // Create directories if not existing
             new FileInfo(report.LocalName).Directory.Create();
 
-            HttpClient client = _httpClientFactory.CreateClient();
+            HttpClient client = _httpClientFactory == null ? new HttpClient() : _httpClientFactory.CreateClient();
 
             var contentbytes = client.GetByteArrayAsync(report.URL).Result;
             using (FileStream fs = new FileStream(report.LocalName, FileMode.Create, FileAccess.Write))
diff --git a/DEM.Net.TestWinForm/DEM.Net.TestWinForm.csproj b/DEM.Net.TestWinForm/DEM.Net.TestWinForm.csproj
index fd670043..cc34e8c8 100644
--- a/DEM.Net.TestWinForm/DEM.Net.TestWinForm.csproj
+++ b/DEM.Net.TestWinForm/DEM.Net.TestWinForm.csproj
@@ -114,8 +114,8 @@
     <None Include="App.config" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="DotSpatial.Projections">
-      <Version>1.9.0</Version>
+    <PackageReference Include="DotSpatial.Projections.NetStandard">
+      <Version>1.0.0</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.NETCore.Platforms">
       <Version>2.2.0</Version>
diff --git a/DEM.Net.TestWinForm/EchantillonsTestsServices.cs b/DEM.Net.TestWinForm/EchantillonsTestsServices.cs
index 97e733c8..7b5a37ac 100644
--- a/DEM.Net.TestWinForm/EchantillonsTestsServices.cs
+++ b/DEM.Net.TestWinForm/EchantillonsTestsServices.cs
@@ -5,6 +5,7 @@
 using System.Text;
 using System.Threading.Tasks;
 using DEM.Net.Core;
+using DEM.Net.Core.Datasets;
 
 namespace DEM.Net.TestWinForm
 {
@@ -15,7 +16,18 @@ public List<BeanPoint_internal> GetPointsTestsByBBox(string p_bbox, DEMDataSet d
             List<BeanPoint_internal> v_pointsToTest = new List<BeanPoint_internal>();
             try
             {
-                RasterService v_rasterService = new RasterService(null);
+                // fix issue #86 to work with opentopography files without proper DI injection
+                RasterIndexServiceResolver rasterIndexServiceResolver = dataSourceType =>
+                {
+                    switch (dataSourceType)
+                    {
+                        case DEMDataSourceType.GDALVrt:
+                            return new GDALVRTFileService(null, null);
+                        default:
+                            throw new KeyNotFoundException(); // or maybe return null, up to you
+                    }
+                };
+                RasterService v_rasterService = new RasterService(rasterIndexServiceResolver);
                 ElevationService v_elevationService = new ElevationService(v_rasterService, null);
                 BoundingBox v_bbox = GeometryService.GetBoundingBox(p_bbox);
                 v_elevationService.DownloadMissingFiles(dataset, v_bbox);