Joomla Hikashop lost php changes after update

Hello I need help to fix a vew errors. A freelancer did some changes in the website, but these changes will be deleted after a Hikashop update because the changes were done in the original files. I created a clone of the website with the Hikashop update instlled. (some code were lost in this version). 1.) Your work is to copy code from the working Hikashop webiste to create woring overrides of the php files so the changes are not lost with the next update of Hikashop. I will give you access to the both websites so you can copy the code. 2.) Some other errors to fix that does not concern the Hikashop update. ====================================== NOTE: You have tho make a protocol of which files were changed. The webisite must work after update of Joomla and all of the extensions installed in the website!!! (use Overrides!) Milestone 100% is prefered ====================================== 1.) Hikashop errors after update of Hikashop: * Fly to chart effect you see on following link not working (error after Hikashop update) * Grey PDF download icon disappeared (error after Hikashop update) * Add to chart - Button image missing (error after Hikashop update working page: [login to view URL] not working page: [login to view URL] * Category view changed after update (error after Hikashop update) working page: [login to view URL] not working page: [login to view URL] * The last step in the checkout process does no work (click on "Ir a la caja") Nothing happens after Hikashop Update. (error after Hikashop update) 2.) Some other errors to fix: * Hikashop shopping cart is not cleared after finnishing the checkout process. * In Hikashop checkout the shipping option disappears sometimes. * Joomla logout error: It seems there is a kind of a loop. After logout appears error page or homepage with "Please login first"-mesages (over 20 times the same message) ____________________________________ This changes should be done urgently. I am avaliable My timezoen: UTC+1 (Western European Summertime) 9:00 - 22:00h Please write the word "Hannes" into your offer so I know that you have read my post eniterly. Thank you!