diff --git a/README.md b/README.md
index 14e9d1c..a6f6eb7 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,8 @@ The remaining two configuration keys are sensitive and should not be made public
 
 - If you have the raw Cookie header from a valid session, you can include the whole header in the `UNEX_COOKIES` variable
 - If you have an exported `cookies.txt` file, you can include the relative path to the file in the `UNEX_COOKIES` variable (like `./cookies.txt`)
-- If you have the `sid_develop` variable, include it in the `UNEX_COOKIES` variable
+- If you have the `nexusmods_session` variable, include it in the `UNEX_COOKIES` variable
+- The lifetime of the `nexusmods_session` value is a week, so you may need to update it regularly
 
 > All relative paths will be parsed relative to the *current working directory*
 
diff --git a/src/NexusUploader/Http/HttpClientExtensions.cs b/src/NexusUploader/Http/HttpClientExtensions.cs
index 66f4989..41292d3 100644
--- a/src/NexusUploader/Http/HttpClientExtensions.cs
+++ b/src/NexusUploader/Http/HttpClientExtensions.cs
@@ -12,7 +12,7 @@ public static IHttpClientBuilder AddNexusClient(this ServiceCollection services)
             return services.AddHttpClient<ManageClient>(client =>
             {
                 client.BaseAddress = new System.Uri("https://www.nexusmods.com");
-                client.DefaultRequestHeaders.UserAgent.Add(new System.Net.Http.Headers.ProductInfoHeaderValue("NexusUploader", "1.0.1"));
+                client.DefaultRequestHeaders.UserAgent.Add(new System.Net.Http.Headers.ProductInfoHeaderValue("NexusUploader", "2.0.0"));
             }).ConfigurePrimaryHttpMessageHandler<NexusCookieHandler>();
         }
 
@@ -22,7 +22,7 @@ public static IHttpClientBuilder AddUploadClient(this IServiceCollection service
             return services.AddHttpClient<UploadClient>(client =>
             {
                 client.BaseAddress = new System.Uri("https://upload.nexusmods.com");
-                client.DefaultRequestHeaders.UserAgent.Add(new System.Net.Http.Headers.ProductInfoHeaderValue("NexusUploader", "1.0.1"));
+                client.DefaultRequestHeaders.UserAgent.Add(new System.Net.Http.Headers.ProductInfoHeaderValue("NexusUploader", "2.0.0"));
             }).ConfigurePrimaryHttpMessageHandler<NexusCookieHandler>();
         }
 
@@ -31,6 +31,7 @@ public static IHttpClientBuilder AddNexusApiClient(this IServiceCollection servi
             return services.AddHttpClient<ApiClient>(client =>
             {
                 client.BaseAddress = new System.Uri("https://api.nexusmods.com/v1/");
+                client.DefaultRequestHeaders.UserAgent.Add(new System.Net.Http.Headers.ProductInfoHeaderValue("NexusUploader", "2.0.0"));
             });
         }
     }
diff --git a/src/NexusUploader/NexusUploader.csproj b/src/NexusUploader/NexusUploader.csproj
index d48e543..540f0d1 100644
--- a/src/NexusUploader/NexusUploader.csproj
+++ b/src/NexusUploader/NexusUploader.csproj
@@ -5,7 +5,7 @@
     <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
     <AssemblyName>unex</AssemblyName>
     <DebugType>embedded</DebugType>
-    <Version>1.0.2</Version>
+    <Version>2.0.0</Version>
   </PropertyGroup>
   <PropertyGroup>
     <PackAsTool>true</PackAsTool>
@@ -36,4 +36,10 @@
     <PackageReference Include="Spectre.Console.Extensions.Logging" Version="0.2.1" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="Test.7z">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>
diff --git a/src/NexusUploader/Services/CookieService.cs b/src/NexusUploader/Services/CookieService.cs
index 9bc2cf3..7e53635 100644
--- a/src/NexusUploader/Services/CookieService.cs
+++ b/src/NexusUploader/Services/CookieService.cs
@@ -25,23 +25,16 @@ public Dictionary<string, string> GetCookies()
                 var ckSet = ParseCookiesTxt(ckTxt);
                 return ckSet;
             }
-            else if (_config.Cookies.StartsWith("{") || _config.Cookies.StartsWith("%7B"))
+            else if (_config.Cookies.Contains('\n'))
             {
-                //almost certainly a raw sid, we'll assume it is
-                var raw = Uri.UnescapeDataString(_config.Cookies);
-                return new Dictionary<string, string> {["sid_develop"] = Uri.EscapeDataString(raw)};
+                var ckSet = ParseCookiesTxt(_config.Cookies.Split('\n'));
+                return ckSet;
             }
             else
             {
-                if (_config.Cookies.Contains('\n'))
-                {
-                    var ckSet = ParseCookiesTxt(_config.Cookies.Split('\n'));
-                    return ckSet;
-                }
-                else
-                {
-                    return _config.Cookies.Split(';').Select(s => s.Trim(' ')).ToDictionary(s => s.Split('=').First(), s => s.Split('=').Last());
-                }
+                //almost certainly a session id, we'll assume it is
+                var raw = Uri.UnescapeDataString(_config.Cookies);
+                return new Dictionary<string, string> {["nexusmods_session"] = Uri.EscapeDataString(raw)};
             }
 
         }
diff --git a/src/NexusUploader/Services/ManageClient.cs b/src/NexusUploader/Services/ManageClient.cs
index 6298c8a..df46fdd 100644
--- a/src/NexusUploader/Services/ManageClient.cs
+++ b/src/NexusUploader/Services/ManageClient.cs
@@ -25,9 +25,8 @@ public ManageClient(HttpClient httpClient, CookieService cookieService, ILogger<
         public async Task<bool> CheckValidSession()
         {
             var uri = "/Core/Libs/Common/Managers/Mods?GetDownloadHistory";
-            using var req = new HttpRequestMessage(HttpMethod.Post, uri);
+            using var req = new HttpRequestMessage(HttpMethod.Get, uri);
             req.Headers.Add("X-Requested-With", "XMLHttpRequest");
-            req.Content = new StringContent("", Encoding.UTF8);
             var resp = await _httpClient.SendAsync(req);
             if (!resp.IsSuccessStatusCode)
             {
@@ -45,7 +44,7 @@ public async Task<bool> AddChangelog(GameRef game, int modId, string version, st
             message.Headers.Add("X-Requested-With", "XMLHttpRequest");
             message.Headers.Add("Referer", $"https://www.nexusmods.com/{game.Name}/mods/edit/?step=docs&id={modId}");
             var content = new MultipartFormDataContent();
-            content.Add(new StringContent(game.Id.ToString()), "game_id");
+            content.Add(new StringContent(game.Id), "game_id");
             content.Add(new StringContent(string.Empty), "new_version[]");
             content.Add(new StringContent(string.Empty), "new_change[]");
             foreach (var change in changeMessage.Split('\n'))
diff --git a/src/NexusUploader/Test.7z b/src/NexusUploader/Test.7z
new file mode 100644
index 0000000..52dacec
Binary files /dev/null and b/src/NexusUploader/Test.7z differ