不需要Unity内部的修改；

UpmGitExtension/Assets/UpmGitExtension/Editor/Core/Extensions/PackageFetchInfo.cs

@@ -52,7 +52,7 @@ namespace Cocklebur
                 compatibleVersions.Add(curVersion.version.ToString());
                 verified = curVersion.version.ToString();
             }
-            VersionsInfo versionsInfo = new VersionsInfo(allVersions, compatibleVersions, verified, null);
+            VersionsInfo versionsInfo = new VersionsInfo(allVersions, compatibleVersions, verified);
 
             for (int i = versions.Count - 1; i >= 0; i--)
             {

UpmGitExtension/Assets/UpmGitExtension/Editor/Core/Extensions/UpmPackageVersionEx.cs

+#if UNITY_2020_3_41|| UNITY_2021_3_12
+#define  UPM_GIT_NEW
+#else
+#undef UPM_GIT_NEW
+#endif
+
 using System;
 using System.Collections.Generic;
 using System.Text.RegularExpressions;
@@ -27,7 +33,9 @@ namespace Cocklebur
 
         public UpmPackageVersionEx(UpmPackageVersion packageVersion) : base(packageVersion.GetPackageInfo(), packageVersion.isInstalled, packageVersion.isUnityPackage)
         {
+#if UPM_GIT_NEW
             packageInfo = packageVersion.GetPackageInfo();
+#endif
             m_MinimumUnityVersion = UnityVersionToSemver(Application.unityVersion).ToString();
             OnAfterDeserialize();
         }
@@ -44,9 +52,10 @@ namespace Cocklebur
         public string fullVersionString { get; private set; }
         public SemVersion semVersion { get; private set; }
 
+#if UPM_GIT_NEW
         [SerializeField]
         internal UnityEditor.PackageManager.PackageInfo packageInfo;
-
+#endif
         [SerializeField]
         private string m_MinimumUnityVersion;
 

UpmGitExtension/Assets/UpmGitExtension/Editor/Core/UpmGitUtils.cs

+#if UNITY_2020_3_41 || UNITY_2021_3_12
+#define  UPM_GIT_NEW
+#else
+#undef UPM_GIT_NEW
+#endif
+
 using System.Collections.Generic;
 using System.IO;
 using UnityEditor;
@@ -143,7 +149,7 @@ namespace Cocklebur
         internal static bool IsError(this UpmAddOperation op)
         {
             if (op == null) return false;
-            return op.logErrorInConsole;
+            return op.error != null;
         }
 
         #endregion
@@ -161,11 +167,12 @@ namespace Cocklebur
 
         internal static PackageInfo GetPackageInfo(this IPackageVersion version)
         {
+#if UPM_GIT_NEW
             if (version == null) return null;
             PackageInfo info;
             string key = version.uniqueId;
             if (dictCachePackageInfo.TryGetValue(key, out info)) return info;
-            var allPkg = PackageInfo.GetAllRegisteredPackages();
+            var allPkg = PackageInfo.GetAll();
             foreach (var pkg in allPkg)
             {
                 SetCachePackageInfo(pkg.packageId, pkg);
@@ -178,6 +185,9 @@ namespace Cocklebur
             //To Do : 重新按照地址下载 PkgInfo ?
 #endif
             return null;
+#else
+            return version.packageInfo;
+#endif
         }
 
         private static void AddPackageInfo(UpmPackageVersionEx version)
@@ -218,13 +228,22 @@ namespace Cocklebur
             EditorUtility.DisplayDialog(L10n.Tr("Unity Package Manager"), message, L10n.Tr("OK"));
         }
 
-        internal static bool IsGit(this IPackageVersion version) { return version.HasTag(PackageTag.Git); }
+        internal static bool IsGit(this IPackageVersion version)
+        {
+#if UPM_GIT_NEW
+            return version.HasTag(PackageTag.Git);
+#else
+            return version.packageInfo.source == UnityEditor.PackageManager.PackageSource.Git;
+#endif
+        }
 
         internal static void UpdateVersions(UpmPackage upmPackage, IEnumerable<UpmPackageVersion> newVersions)
         {
-            //upmPackage.UpdateVersions(newVersions);
-            //(upmPackage.versions as UpmVersionList).GetUpdateTarget
-
+#if UPM_GIT_NEW
+            upmPackage.UpdateVersions(newVersions, 0);
+#else
+            upmPackage.UpdateVersions(newVersions);
+#endif
         }
 
         #endregion

UpmGitExtension/Packages/packages-lock.json

@@ -7,14 +7,14 @@
       "dependencies": {
         "com.unity.services.core": "1.0.1"
       },
-      "url": "https://packages.unity.com"
+      "url": "https://packages.unity.cn"
     },
     "com.unity.ext.nunit": {
       "version": "1.0.6",
       "depth": 1,
       "source": "registry",
       "dependencies": {},
-      "url": "https://packages.unity.com"
+      "url": "https://packages.unity.cn"
     },
     "com.unity.ide.visualstudio": {
       "version": "2.0.16",
@@ -23,32 +23,23 @@
       "dependencies": {
         "com.unity.test-framework": "1.1.9"
       },
-      "url": "https://packages.unity.com"
+      "url": "https://packages.unity.cn"
     },
     "com.unity.ide.vscode": {
       "version": "1.2.5",
       "depth": 0,
       "source": "registry",
       "dependencies": {},
-      "url": "https://packages.unity.com"
-    },
-    "com.unity.nuget.newtonsoft-json": {
-      "version": "3.0.2",
-      "depth": 2,
-      "source": "registry",
-      "dependencies": {},
-      "url": "https://packages.unity.com"
+      "url": "https://packages.unity.cn"
     },
     "com.unity.services.core": {
-      "version": "1.5.2",
+      "version": "1.0.1",
       "depth": 1,
       "source": "registry",
       "dependencies": {
-        "com.unity.modules.unitywebrequest": "1.0.0",
-        "com.unity.nuget.newtonsoft-json": "3.0.2",
-        "com.unity.modules.androidjni": "1.0.0"
+        "com.unity.modules.unitywebrequest": "1.0.0"
       },
-      "url": "https://packages.unity.com"
+      "url": "https://packages.unity.cn"
     },
     "com.unity.test-framework": {
       "version": "1.1.33",
@@ -59,7 +50,7 @@
         "com.unity.modules.imgui": "1.0.0",
         "com.unity.modules.jsonserialize": "1.0.0"
       },
-      "url": "https://packages.unity.com"
+      "url": "https://packages.unity.cn"
     },
     "com.unity.timeline": {
       "version": "1.6.4",
@@ -71,7 +62,7 @@
         "com.unity.modules.audio": "1.0.0",
         "com.unity.modules.particlesystem": "1.0.0"
       },
-      "url": "https://packages.unity.com"
+      "url": "https://packages.unity.cn"
     },
     "com.unity.modules.ai": {
       "version": "1.0.0",
@@ -218,6 +209,17 @@
       "version": "1.0.0",
       "depth": 0,
       "source": "builtin",
+      "dependencies": {
+        "com.unity.modules.ui": "1.0.0",
+        "com.unity.modules.imgui": "1.0.0",
+        "com.unity.modules.jsonserialize": "1.0.0",
+        "com.unity.modules.uielementsnative": "1.0.0"
+      }
+    },
+    "com.unity.modules.uielementsnative": {
+      "version": "1.0.0",
+      "depth": 1,
+      "source": "builtin",
       "dependencies": {
         "com.unity.modules.ui": "1.0.0",
         "com.unity.modules.imgui": "1.0.0",

UpmGitExtension/ProjectSettings/PackageManagerSettings.asset

@@ -13,24 +13,23 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   m_EnablePreReleasePackages: 0
+  m_EnablePackageDependencies: 1
   m_AdvancedSettingsExpanded: 1
   m_ScopedRegistriesSettingsExpanded: 1
-  m_SeeAllPackageVersions: 0
-  m_DismissPreviewPackagesInUse: 0
+  m_SeeAllPackageVersions: 1
   oneTimeWarningShown: 1
   m_Registries:
   - m_Id: main
     m_Name: 
-    m_Url: https://packages.unity.com
+    m_Url: https://packages.unity.cn
     m_Scopes: []
     m_IsDefault: 1
     m_Capabilities: 7
-    m_ConfigSource: 0
   m_UserSelectedRegistryName: 
   m_UserAddingNewScopedRegistry: 0
   m_RegistryInfoDraft:
     m_Modified: 0
     m_ErrorMessage: 
-    m_UserModificationsInstanceId: -842
-    m_OriginalInstanceId: -844
+    m_UserModificationsInstanceId: -826
+    m_OriginalInstanceId: -828
   m_LoadAssets: 0

UpmGitExtension/ProjectSettings/ProjectVersion.txt

-m_EditorVersion: 2022.2.0b14
-m_EditorVersionWithRevision: 2022.2.0b14 (0220fa099330)
+m_EditorVersion: 2020.3.41f1c1
+m_EditorVersionWithRevision: 2020.3.41f1c1 (148a17cb7d64)