Update README.md

added direct links for various macs

README.md

@@ -12,9 +12,11 @@ The desktop environment on the compute node *alien-one* is accessible
 through VNC protocol. Any VNC viewer can be used. If in doubt, try the
 cross-platform TigerVNC viewer [available from here for
 Windows](https://bintray.com/tigervnc/stable/download_file?file_path=vncviewer-1.11.0.exe),
-or as a package from your GNU/Linux distribution. If you are neither on GNU/Linux, nor on Windows,
+or as a package from your GNU/Linux distribution. 
+For Mac users, 
 [here is the Java version of the viewer](https://bintray.com/tigervnc/stable/download_file?file_path=VncViewer-1.11.0.jar).
-
+If you are on OS11 (big Sur) [try this direct download](http://tigervnc.bphinz.com/nightly/osx/TigerVNC-1.11.80.dmg)
+If you are on OS10 (catalina) [try this direct download](https://bintray.com/tigervnc/beta/download_file?file_path=TigerVNC-1.10.90.dmg)
 
 
 **Before** connecting, you need: