diff --git a/plugin/plugins/dynamix.unraid.net.plg b/plugin/plugins/dynamix.unraid.net.plg
index f20269ece..1de535b21 100755
--- a/plugin/plugins/dynamix.unraid.net.plg
+++ b/plugin/plugins/dynamix.unraid.net.plg
@@ -384,6 +384,7 @@ if [ -f /tmp/restore-files-dynamix-unraid-net ]; then
     "/usr/local/emhttp/plugins/dynamix/include/DefaultPageLayout.php"
     "/usr/local/emhttp/plugins/dynamix/include/ProvisionCert.php"
     "/usr/local/emhttp/plugins/dynamix/include/UpdateDNS.php"
+    "/usr/local/emhttp/plugins/dynamix/include/ReplaceKey.php"
     "/usr/local/emhttp/plugins/dynamix/include/Wrappers.php"
     "/usr/local/emhttp/plugins/dynamix.plugin.manager/Downgrade.page"
     "/usr/local/emhttp/plugins/dynamix.plugin.manager/Update.page"
@@ -505,6 +506,7 @@ echo
 preserveFilesDirs=(
   "move:/usr/local/emhttp/plugins/dynamix/Registration.page:preventDowngrade"
   "move:/usr/local/emhttp/plugins/dynamix/include/UpdateDNS.php:preventDowngrade"
+  "move:/usr/local/emhttp/plugins/dynamix/include/ReplaceKey.php:preventDowngrade"
   "move:/usr/local/emhttp/plugins/dynamix.plugin.manager/Downgrade.page:preventDowngrade"
   "move:/usr/local/emhttp/plugins/dynamix.plugin.manager/Update.page:preventDowngrade"
   "move:/usr/local/emhttp/plugins/dynamix.plugin.manager/scripts/unraidcheck:preventDowngrade"
diff --git a/plugin/source/dynamix.unraid.net/usr/local/emhttp/plugins/dynamix/include/ReplaceKey.php b/plugin/source/dynamix.unraid.net/usr/local/emhttp/plugins/dynamix/include/ReplaceKey.php
new file mode 100644
index 000000000..640867b02
--- /dev/null
+++ b/plugin/source/dynamix.unraid.net/usr/local/emhttp/plugins/dynamix/include/ReplaceKey.php
@@ -0,0 +1,239 @@
+<?php
+$webguiGlobals = $GLOBALS;
+$docroot = $docroot ?? $_SERVER['DOCUMENT_ROOT'] ?: '/usr/local/emhttp';
+
+class ReplaceKey
+{
+    private const KEY_SERVER_URL = 'https://keys.lime-technology.com';
+
+    private $docroot;
+    private $var;
+    private $guid;
+    private $keyfile;
+    private $regExp;
+
+    public function __construct()
+    {
+        $this->docroot = $GLOBALS['docroot'] ?? $_SERVER['DOCUMENT_ROOT'] ?: '/usr/local/emhttp';
+
+        $this->var = (array)@parse_ini_file('/var/local/emhttp/var.ini');
+        $this->guid = @$this->var['regGUID'] ?? null;
+
+        $keyfileBase64 = empty($this->var['regFILE']) ? null : @file_get_contents($this->var['regFILE']);
+        if ($keyfileBase64 !== false) {
+            $keyfileBase64 = @base64_encode($keyfileBase64);
+            $this->keyfile = str_replace(['+', '/', '='], ['-', '_', ''], trim($keyfileBase64));
+        }
+
+        $this->regExp = @$this->var['regExp'] ?? null;
+    }
+
+    private function request($url, $method, $payload = null, $headers = null)
+    {
+        $ch = curl_init($url);
+
+        // Set the request method
+        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
+        // store the response in a variable instead of printing it
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+
+        // Set the payload if present
+        if ($payload !== null) {
+            curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
+        }
+
+        if ($headers !== null) {
+            // Set the headers
+            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
+        }
+
+        // Set additional options as needed
+
+        // Execute the request
+        $response = curl_exec($ch);
+
+        // Check for errors
+        if (curl_errno($ch)) {
+            $error = [
+                'heading' => 'CurlError',
+                'message' => curl_error($ch),
+                'level' => 'error',
+                'ref' => 'curlError',
+                'type' => 'request',
+            ];
+            // @todo store error
+        }
+
+        // Close the cURL session
+        curl_close($ch);
+
+        return $response;
+    }
+
+    private function validateGuid()
+    {
+        $headers = [
+            'Content-Type: application/x-www-form-urlencoded',
+        ];
+
+        $params = [
+            'guid' => $this->guid,
+            'keyfile' => $this->keyfile,
+        ];
+
+        /**
+         * returns {JSON}
+         * hasNewerKeyfile : boolean;
+         * purchaseable: true;
+         * registered: false;
+         * replaceable: false;
+         * upgradeable: false;
+         * upgradeAllowed: string[];
+         * updatesRenewable: false;
+         */
+        $response = $this->request(
+            self::KEY_SERVER_URL . '/validate/guid',
+            'POST',
+            http_build_query($params),
+            $headers,
+        );
+
+        // Handle the response as needed (parsing JSON, etc.)
+        $decodedResponse = json_decode($response, true);
+
+        if (!empty($decodedResponse)) {
+            return $decodedResponse;
+        }
+
+        // @todo save error response somewhere
+        return [];
+    }
+
+    private function getLatestKey()
+    {
+        $headers = [
+            'Content-Type: application/x-www-form-urlencoded',
+        ];
+
+        $params = [
+            'keyfile' => $this->keyfile,
+        ];
+
+        /**
+         * returns {JSON}
+         * license: string;
+         */
+        $response = $this->request(
+            self::KEY_SERVER_URL . '/key/latest',
+            'POST',
+            http_build_query($params),
+            $headers,
+        );
+
+        // Handle the response as needed (parsing JSON, etc.)
+        $decodedResponse = json_decode($response, true);
+
+        if (!empty($decodedResponse) && !empty($decodedResponse['license'])) {
+            return $decodedResponse['license'];
+        }
+        return null;
+    }
+
+    private function installNewKey($key): bool
+    {
+        require_once "$this->docroot/webGui/include/InstallKey.php";
+
+        $KeyInstaller = new KeyInstaller();
+        $installResponse = $KeyInstaller->installKey($key);
+
+        $installSuccess = false;
+
+        if (!empty($installResponse)) {
+            $decodedResponse = json_decode($installResponse, true);
+            if (isset($decodedResponse['error'])) {
+                $this->writeJsonFile(
+                    '/tmp/ReplaceKey/error.json',
+                    [
+                        'error' => $decodedResponse['error'],
+                        'ts' => time(),
+                    ]
+                );
+                $installSuccess = false;
+            } else {
+                $installSuccess = true;
+            }
+        }
+
+        // Set up notification for key installation result
+        $keyType = basename($key, '.key');
+        $output  = _var($notify,'plugin');
+        $script  = '/usr/local/emhttp/webGui/scripts/notify';
+
+        if ($installSuccess) {
+            $event = "Installed New $keyType License";
+            $subject = "Your new $keyType license key has been automatically installed";
+            $description = "";
+            $importance = "normal $output";
+        } else {
+            $event = "Failed to Install New $keyType License";
+            $subject = "Failed to automatically install your new $keyType license key";
+            $description = isset($decodedResponse['error']) ? $decodedResponse['error'] : "Unknown error occurred";
+            $importance = "alert $output";
+        }
+
+        exec("$script -e ".escapeshellarg($event)." -s ".escapeshellarg($subject)." -d ".escapeshellarg($description)." -i ".escapeshellarg($importance)." -l '/Tools/Registration' -x");
+
+        return $installSuccess;
+    }
+
+    private function writeJsonFile($file, $data)
+    {
+        if (!is_dir(dirname($file))) {
+            mkdir(dirname($file));
+        }
+
+        file_put_contents($file, json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
+    }
+
+    public function check(bool $forceCheck = false): ?bool
+    {
+        // we don't need to check
+        if (empty($this->guid) || empty($this->keyfile) || empty($this->regExp)) {
+            return null;
+        }
+
+        // Check if we're within the 7-day window before and after regExp
+        $now = time();
+        $sevenDaysBefore = strtotime('-7 days', $this->regExp);
+        $sevenDaysAfter = strtotime('+7 days', $this->regExp);
+
+        $isWithinWindow = ($now >= $sevenDaysBefore && $now <= $sevenDaysAfter);
+
+        if (!$forceCheck && !$isWithinWindow) {
+            return null;
+        }
+
+        // see if we have a new key
+        $validateGuidResponse = $this->validateGuid();
+
+        $hasNewerKeyfile = @$validateGuidResponse['hasNewerKeyfile'] ?? false;
+        if (!$hasNewerKeyfile) {
+            return null; // if there is no newer keyfile, we don't need to do anything
+        }
+
+        $latestKey = $this->getLatestKey();
+        if (!$latestKey) {
+            // we supposedly have a new key, but didn't get it back…
+            $this->writeJsonFile(
+                '/tmp/ReplaceKey/error.json',
+                [
+                    'error' => 'Failed to retrieve latest key after getting a `hasNewerKeyfile` in the validation response.',
+                    'ts' => time(),
+                ]
+            );
+            return null;
+        };
+
+        return $this->installNewKey($latestKey);
+    }
+}