guest checkout button not showing

-- url of the page with the problem -- : www.funstartforkids.com.au/
-- HikaShop version -- : 2.3.4
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.3.28
-- Browser(s) name and version -- : firefox 33.0.2
-- Error-message(debug-mod must be tuned on) -- : getting no error

Hi, I recently upgrading my client site. I upgrade joomla 2.5 to 3.3.6 and also upgrade business hikashop latest version. but now I am getting problem with checkout process.
guest user email and address not saving.
calculate shipping not working
process checkout button not showing.

Hi, I just reinstall the component. now Its showing the process checkout button and save the address but when I press "process checkout button" its remain same page. not going next step.

Hi, Thanks for your reply. all the problems seems to be solved after reinstall the files.