diff --git a/src/isnd/Controllers/PackageVersionController.cs b/src/isnd/Controllers/PackageVersionController.cs
index 77ea3cc..164e190 100644
--- a/src/isnd/Controllers/PackageVersionController.cs
+++ b/src/isnd/Controllers/PackageVersionController.cs
@@ -22,10 +22,10 @@ namespace isn
         // GET: PackageVersion
         public async Task<IActionResult> Index(PackageVersionIndexViewModel model)
         {
-            var applicationDbContext = _context.PackageVersions.Include(p => p.Package).Where(p => p.PackageId.StartsWith(model.PackageId));
-
+            var applicationDbContext = _context.PackageVersions.Include(p => p.Package).Where(
+                p => ( model.Prerelease || p.IsPrerelease)
+            && ((model.PackageId == null) || p.PackageId.StartsWith(model.PackageId)));
             model.Versions = await applicationDbContext.ToArrayAsync();
-
             return View(model);
         }
 
diff --git a/src/isnd/Controllers/PackagesController.Put.cs b/src/isnd/Controllers/PackagesController.Put.cs
index b8d1f01..cdbd697 100644
--- a/src/isnd/Controllers/PackagesController.Put.cs
+++ b/src/isnd/Controllers/PackagesController.Put.cs
@@ -104,14 +104,26 @@ namespace isn.Controllers
                             var destdir = new DirectoryInfo(dest.DirectoryName);
                             if (dest.Exists)
                             {
-                                ViewData["msg"] = "existant";
-                                ViewData["ecode"] = 1;
-                                _logger.LogWarning("400 : existant");
-                                return base.BadRequest(new { error = ModelState });
+                                // La version existe sur le disque,
+                                // mais si elle ne l'est pas en base de donnéés,
+                                // on remplace la version sur disque.
+                                var pkgv = _dbContext.PackageVersions.Where(
+                                    v => v.PackageId == package.Id 
+                                );
+                                
+                                if (pkgv !=null && pkgv.Count()==0) 
+                                {
+                                    dest.Delete();
+                                }
+                                else {
+                                    ViewData["msg"] = "existant";
+                                    ViewData["ecode"] = 1;
+                                    _logger.LogWarning("400 : existant");
+                                    return base.BadRequest(new { error = ModelState });
+                                }
                             }
-                            else
                             {
-                                destdir.Create();
+                                if (!destdir.Exists) destdir.Create();
                                 source.MoveTo(fullpath);
                                 files.Add(name);
                                 string fullstringversion = version.ToFullString();
@@ -156,7 +168,12 @@ namespace isn.Controllers
                                 }
                             }
                         }
-                        nuspec.ExtractToFile(Path.Combine(pkgpath, pkgid + ".nuspec"));
+                        string nuspecfullpath = Path.Combine(pkgpath, pkgid + ".nuspec");
+                        FileInfo nfpi = new FileInfo(nuspecfullpath);
+
+                        if (nfpi.Exists)
+                           nfpi.Delete();
+                        nuspec.ExtractToFile(nuspecfullpath);
                     }
 
                 }
diff --git a/src/isnd/Services/PackageManager.cs b/src/isnd/Services/PackageManager.cs
index 47f27ed..761048b 100644
--- a/src/isnd/Services/PackageManager.cs
+++ b/src/isnd/Services/PackageManager.cs
@@ -2,6 +2,8 @@ using System.Collections.Generic;
 using System.Linq;
 using isn.Controllers;
 using isn.Data;
+using isn.ViewModels;
+using isnd.ViewModels;
 using Microsoft.EntityFrameworkCore;
 using NuGet.Versioning;
 using Unleash;
@@ -15,7 +17,7 @@ namespace isnd.Services
         {
             this.dbContext = dbContext;
         }
-        public IndexResult SearchByName(string query, 
+        public PackageIndexViewModel SearchByName(string query, 
              int skip, int take,bool prerelease = false, 
              string packageType = null)
         {
@@ -30,7 +32,7 @@ namespace isnd.Services
             var total = scope.Count();
             var pkgs = scope.Skip(skip).Take(take).ToArray();
 
-            return new IndexResult
+            return new PackageIndexViewModel
                 {
                     totalHits = total,
                     data = pkgs
diff --git a/src/isnd/ViewModels/PackageIndexViewModel.cs b/src/isnd/ViewModels/PackageIndexViewModel.cs
new file mode 100644
index 0000000..0469f82
--- /dev/null
+++ b/src/isnd/ViewModels/PackageIndexViewModel.cs
@@ -0,0 +1,11 @@
+using isn.Data;
+
+namespace isnd.ViewModels
+{
+    public class PackageIndexViewModel
+    {
+        public Package[] data {get; set;}
+        public string Query { get; set; }
+        public int totalHits { get; internal set; }
+    }
+}
\ No newline at end of file