Zen-Cart Upgrade

I need a Zen-Cart website upgraded from version 1.2.5 to the latest. The current site is having problems in the Admin section in that some of the menu items don\'t appear on login.

I will also require SAGEPAY installed. There is already an SSL Certifice in place.

This requires someone adapt with coding in Zen-Cart. I will allow the lucky winner the ability to view the site with full control panel access prior to their quotation.

Please don\'t offer a different Ecommerce solution!
Please don\'t reply if you have limited experience!
Realistic quotes only will be considered!
No - time wasters!