title: Jmeter failed to download plugins repository
body: <p>I need to use jmeter on a working machine without internet access. I installed Apache Jmeter 5.2.1 myself, downloaded plugins-manager.jar and put it into lib / ext directory, then restarted JMeter. </p>
  
  <p>But when I try to go to Jmeter -> Options -> Plugins Manager, I see this error:</p>
  
  <p><a href="https://i.stack.imgur.com/2S2eY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2S2eY.png" alt="enter image description here"></a></p>