Update README.md

README.md

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 Current Version : INSEL 8.3 Beta7:
   * For [Windows](https://bwsyncandshare.kit.edu/s/nenYqtBfkfncJxC).
-  * For Ubuntu 20.04 : TODO
-  * For Ubuntu 18.04 : TODO
-  * For macOS : TODO
+  * For [Ubuntu 20.04](https://bwsyncandshare.kit.edu/s/QFYeyRg8isnAE2G)
+  * For Ubuntu 18.04 TODO
+  * For [macOS](https://bwsyncandshare.kit.edu/s/bBRFYwsoLMqPSE6) (Very experimental)
 
 ## Timeline