Hi all
Sorry for the delay,
here is the link to download the security update as well as direct downloading iTunes in order to be able to re install it.
https://support.apple.com/en_GB/downloads/macos.
Also for the people who asked how to remove iTunes without loosing your library you should take these steps to not face the hassle of re importing your library and loosing any data or music ratings or so...
1- you should open finder , and from the top menu chose=> go => library=> music and DRAG THE (ITUNES FOLDER) to your desktop for instance.
2- use the free app named ( app cleaner and installer) to un install iTunes. Google it.
3- Reinstall re iTunes from the linked given above.
4- Move the ITUNES FORLDER back to where you first moved it ( address in step 1)
without opening iTunes connect your phone and it will ask for a software update for iTunes to connect to your phone.
5- install it and your phone should show in iTunes as it used to be and will work properly .
Let me know if you had any doubts in these steps.
Cheers