diff --git a/src/classisland.test.ts b/src/classisland.test.ts
index 0706885..f6d3906 100644
--- a/src/classisland.test.ts
+++ b/src/classisland.test.ts
@@ -38,12 +38,12 @@ function classIslandHealthResponse(input: string | URL): Response | undefined {
     : undefined;
 }
 
-test("ClassIsland versions enforce the 2.1.1.0 minimum", () => {
-  assert.equal(compareClassIslandVersions("2.1.1.0", "2.1.1.0"), 0);
-  assert.equal(compareClassIslandVersions("2.1.1.1", "2.1.1.0") > 0, true);
-  assert.equal(compareClassIslandVersions("2.1.0.9", "2.1.1.0") < 0, true);
-  assert.equal(isCompatibleClassIslandVersion("2.1.1.0"), true);
-  assert.equal(isCompatibleClassIslandVersion("2.1.0.9"), false);
+test("ClassIsland versions enforce the 2.0.0.0 minimum", () => {
+  assert.equal(compareClassIslandVersions("2.0.0.0", "2.0.0.0"), 0);
+  assert.equal(compareClassIslandVersions("2.0.0.1", "2.0.0.0") > 0, true);
+  assert.equal(compareClassIslandVersions("1.9.0.9", "2.0.0.0") < 0, true);
+  assert.equal(isCompatibleClassIslandVersion("2.0.0.0"), true);
+  assert.equal(isCompatibleClassIslandVersion("1.9.0.9"), false);
   assert.equal(isCompatibleClassIslandVersion(undefined), false);
 });
 
@@ -74,8 +74,8 @@ test("discovers multiple ClassIsland versions and marks old versions incompatibl
   const paths = ["C:\\Portable\\ClassIsland.exe", "D:\\Old\\ClassIsland.exe", "C:\\Program Files\\ClassIsland\\ClassIsland.exe"];
   const versions: Record<string, string> = {
     [paths[0]]: "2.1.1.0",
-    [paths[1]]: "2.0.4.0",
-    [paths[2]]: "2.1.1.0"
+    [paths[1]]: "1.9.0.0",
+    [paths[2]]: "2.0.4.0"
   };
   const found = await discoverClassIslandInstallations({
     platform: "win32",
@@ -91,7 +91,8 @@ test("discovers multiple ClassIsland versions and marks old versions incompatibl
   assert.equal(found.find((item) => item.executablePath === paths[0])?.isRunning, true);
   assert.deepEqual(found.find((item) => item.executablePath === paths[0])?.launchArgs, ["--quiet"]);
   assert.equal(found.find((item) => item.executablePath === paths[1])?.compatible, false);
-  assert.match(found.find((item) => item.executablePath === paths[1])?.reason || "", /2\.1\.1\.0/);
+  assert.match(found.find((item) => item.executablePath === paths[1])?.reason || "", /2\.0\.0\.0/);
+  assert.equal(found.find((item) => item.executablePath === paths[2])?.compatible, true);
 });
 
 test("maps the running ClassIsland.Desktop process back to its launcher and closes the real instance", async () => {
@@ -289,7 +290,7 @@ test("does not write a package when ClassIsland is too old or the digest is inva
   try {
     const exe = path.win32.join(root, "ClassIsland.exe");
     fs.writeFileSync(exe, "test executable");
-    const oldInstaller = new ClassIslandInstaller({ platform: "win32", executablePaths: [exe], runningProcesses: [], versionOf: () => "2.1.0.9", exists: (candidate) => fs.existsSync(candidate) });
+    const oldInstaller = new ClassIslandInstaller({ platform: "win32", executablePaths: [exe], runningProcesses: [], versionOf: () => "1.9.0.0", exists: (candidate) => fs.existsSync(candidate) });
     const [oldTarget] = await oldInstaller.detect();
     const [oldResult] = await oldInstaller.install([oldTarget.id]);
     assert.equal(oldResult.action, "skipped");
diff --git a/src/classisland.ts b/src/classisland.ts
index 15d4875..e30f1e9 100644
--- a/src/classisland.ts
+++ b/src/classisland.ts
@@ -10,7 +10,7 @@ import { DEFAULT_MARKETPLACE_PROXY_URL, describeDownloadAttempt, marketplaceRequ
 export const CLASSISLAND_PLUGIN_REPOSITORY = "SECTL/ClassIsland-SecAgent-Plugin";
 export const CLASSISLAND_PLUGIN_ID = "classisland.secagent";
 export const CLASSISLAND_PLUGIN_ASSET_NAME = "ClassIsland.SecAgent.Plugin.cipx";
-export const MIN_CLASSISLAND_VERSION = "2.1.1.0";
+export const MIN_CLASSISLAND_VERSION = "2.0.0.0";
 export const CLASSISLAND_RELEASE_API_URL = `https://api.github.com/repos/${CLASSISLAND_PLUGIN_REPOSITORY}/releases/latest`;
 const CLASSISLAND_RELEASE_PAGE_URL = `https://github.com/${CLASSISLAND_PLUGIN_REPOSITORY}/releases/latest`;
 
diff --git a/src/renderer/src/components/OobeWizard.tsx b/src/renderer/src/components/OobeWizard.tsx
index fbdeb4b..144daf4 100644
--- a/src/renderer/src/components/OobeWizard.tsx
+++ b/src/renderer/src/components/OobeWizard.tsx
@@ -555,7 +555,7 @@ export function OobeWizard() {
       return false;
     }
     if (selectedTargets.some((target) => !target.compatible)) {
-      setError("所选 ClassIsland 版本低于 2.1.1.0，无法安装联动插件");
+      setError("所选 ClassIsland 版本低于 2.0.0.0，无法安装联动插件");
       return false;
     }
     // Holds land on the 50-100 half of the card when the SecAgent connector