diff --git a/octoprint_karmen/__init__.py b/octoprint_karmen/__init__.py
index bdd851b..01560d8 100644
--- a/octoprint_karmen/__init__.py
+++ b/octoprint_karmen/__init__.py
@@ -3,6 +3,7 @@
 
 from octoprint.settings import settings
 import octoprint.plugin
+from octoprint.util.version import is_octoprint_compatible
 from .websocket_proxy import Connector
 from .utils import SentryWrapper
 
@@ -38,6 +39,7 @@ def get_template_vars(self):
         else:
             key_redacted = (key[:2] + "*" * (len(key) - 4) + key[-2:]) if key else None
         return {
+            "is_octoprint_compatible": self.is_octoprint_compatible,
             "ws_server": self._settings.get(["ws_server"]),
             "path_whitelist": list(filter(None, self._settings.get(["path_whitelist"]).split(";"))),
             "api_port": self.port,
@@ -107,8 +109,10 @@ def ws_proxy_connect(self):
         api_url = f"{self.host}:{self.port}"
         url = f"{ws_server_url}/{key}"
         if not key:
-            self._logger.info("No Karmen device key provided; Not connecting.")
+            self._logger.warning("No Karmen device key provided.")
             return
+        if not self.is_octoprint_compatible:
+            self._logger.warning("Incompatible octoprint.")
         self.con = Connector(url, api_url, self._logger, self._settings.get(["path_whitelist"]), self.sentry)
         self.con.connect()
 
@@ -119,6 +123,7 @@ def ws_proxy_reconnect(self):
         self.ws_proxy_connect()
 
     def on_startup(self, host, port):
+        self.is_octoprint_compatible = is_octoprint_compatible(">1.8")
         self.con = None
         self.host = host
         self.port = port
diff --git a/octoprint_karmen/static/js/karmen.js b/octoprint_karmen/static/js/karmen.js
index 720d034..1e694d4 100644
--- a/octoprint_karmen/static/js/karmen.js
+++ b/octoprint_karmen/static/js/karmen.js
@@ -4,26 +4,80 @@
  * Author: Pavel Vojacek
  * License: MIT
  */
-$(function() {
+$(function () {
     function KarmenViewModel(parameters) {
         var self = this;
+        let performCheck = function () {
+            OctoPrint.system.getInfo().then((info) => {
+                function versionCompare(v1, v2, options) {
+                    var lexicographical = options && options.lexicographical,
+                        zeroExtend = options && options.zeroExtend,
+                        v1parts = v1.split('.'),
+                        v2parts = v2.split('.');
 
-        // assign the injected parameters, e.g.:
-        // self.loginStateViewModel = parameters[0];
-        // self.settingsViewModel = parameters[1];
+                    function isValidPart(x) {
+                        return (lexicographical ? /^\d+[A-Za-z]*$/ : /^\d+$/).test(x);
+                    }
 
-        // TODO: Implement your plugin's view model here.
+                    if (!v1parts.every(isValidPart) || !v2parts.every(isValidPart)) {
+                        return NaN;
+                    }
+
+                    if (zeroExtend) {
+                        while (v1parts.length < v2parts.length) v1parts.push("0");
+                        while (v2parts.length < v1parts.length) v2parts.push("0");
+                    }
+
+                    if (!lexicographical) {
+                        v1parts = v1parts.map(Number);
+                        v2parts = v2parts.map(Number);
+                    }
+
+                    for (var i = 0; i < v1parts.length; ++i) {
+                        if (v2parts.length == i) {
+                            return 1;
+                        }
+
+                        if (v1parts[i] == v2parts[i]) {
+                            continue;
+                        }
+                        else if (v1parts[i] > v2parts[i]) {
+                            return 1;
+                        }
+                        else {
+                            return -1;
+                        }
+                    }
+
+                    if (v1parts.length != v2parts.length) {
+                        return -1;
+                    }
+
+                    return 0;
+                }
+
+                let version = info.systeminfo["octoprint.version"]
+                if (versionCompare(version, "1.8") < 0) {
+                    self.notify = new PNotify({
+                        text:`This version of Karmen Connector is not supported in Octoprint version ${version}. 
+                        Please upgrade to Octoprint 1.8+ or use legacy plugin. 
+                        Check plugin settings for details.`,
+                        title: "Karmen Connector",
+                        type: "error",
+                        delay: 10000,
+                    });
+                }
+            });
+        }
+
+        self.onUserLoggedIn = function () {
+            performCheck();
+        }
     }
 
-    /* view model class, parameters for constructor, container to bind to
-     * Please see http://docs.octoprint.org/en/master/plugins/viewmodels.html#registering-custom-viewmodels for more details
-     * and a full list of the available options.
-     */
     OCTOPRINT_VIEWMODELS.push({
         construct: KarmenViewModel,
-        // ViewModels your plugin depends on, e.g. loginStateViewModel, settingsViewModel, ...
-        dependencies: [ /* "loginStateViewModel", "settingsViewModel" */ ],
-        // Elements to bind to, e.g. #settings_plugin_karmen, #tab_plugin_karmen, ...
-        elements: [ /* ... */ ]
+        dependencies: ["settingsViewModel", "loginStateViewModel"],
+        elements: [ /* ... */]
     });
 });
diff --git a/octoprint_karmen/templates/karmen_settings.jinja2 b/octoprint_karmen/templates/karmen_settings.jinja2
index 358c3ee..073b1cb 100644
--- a/octoprint_karmen/templates/karmen_settings.jinja2
+++ b/octoprint_karmen/templates/karmen_settings.jinja2
@@ -34,6 +34,7 @@
     </a>
 </div>
 
+{% if is_octoprint_compatible %}
 <div class="karmen-block">
     <form class="form-horizontal">
         <p>
@@ -94,3 +95,17 @@
     <p>Never share your API or device keys with ANYONE.</p>
     <p>Please follow our guidelines and do not use the primary Octoprint key when setting up the Karmen plugin. Rather, create a special key for that purpose as described in our <a href="https://docs.karmen.tech/"/>documentation</a></p>
 </div>
+{% else %}
+<div class=karmen-block">
+    <h4>This version is incompatible with Octoprint 1.7 and lower</h4>
+    <p>You can:</p>
+    <ul>
+    <li>Upgrade Octoprint to version 1.8 or higher (highly recommended)</li>
+    or
+    <li>Install version 0.4.0 of Karmen Connector</li>
+    </ul>
+    <p>To install version 0.4.0 go to <b>Octoprint Settings</b> -> <b>Plugin Manager</b> -> <b>+ Get more</b> and to <b>... from URL</b> field enter
+        <code>https://github.com/fragaria/karmen-octoprint-plugin/archive/refs/tags/0.4.0-legacy.zip</code> and click <b>Install</b>
+    </p>
+</div>
+{% endif %}
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 37243bb..a31808f 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@
 plugin_license = "MIT"
 
 # Any additional requirements besides OctoPrint should be listed here
-plugin_requires = ['Octoprint>=1.8',]
+plugin_requires = []
 
 ### --------------------------------------------------------------------------------------------------------------------
 ### More advanced options that you usually shouldn't have to touch follow after this point