I am trying to download and install Citrix client and it comes in a zipped file. Can anyone please tell me how to unzip a file in OS X and what needs to be done.
I just double click the .zip file.
What version of OS X do you have? All you should need to do is double-click it to extract the .dmg, then double-click MacICA_OSX.dmg to open it in the Finder. Finally, double-click ICA Client.pkg (lots of clicking here, huh?) to install.
That depends on what OS you are using. zip support in OS X wasn't added until 10.3. So if you are using an older version, you'll need 3rd party software.