XF 2.1 conditional if user come from search engine

[Majora]

Hello,
i need a conditional for xenforo 2.1.1

Please take a look at this thread: https://www.winboard.org/threads/ram-ohne-grund-zu-50-ausgelastet.260912/

If you come from search engine and type "site:" before the url in google and come to the thread again, there a an ad in second post.
Here are the code: https://www.google.com/search?q=sit....69i57j69i58.895j0j4&sourceid=chrome&ie=UTF-8

How can i do the same for search engine users?

Can you help me with that with xenForo 2.1.1?

xenForo 1 use the following code: https://xenforo.com/community/threads/conditional-if-user-comes-from-search-engine.29459/

What is the code for xenForo 2.1.1? Thank you!

Matthias

 

[Paul B]

That criterion doesn't exist in XF2.

 

[Majora]

how can i used it in xenforo 2? Do i need an addon?