Error when upgrading from 2.3.4 to 2.6.0

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 2.5.28 and 3.4.5

Hello friends, first apologize for my English because I am using google translator ekl.
I have version 2.3.4 installed busines and upgrade to version 2.6.0, apparently everything perfect. But when you make a purchase process when you click on the "proceed with payment" button does nothing and stays on the same screen.
When reinstalling version 2.3.4 everything works again correctly.

Please indicate that you can do to update.
Thank you.

I downloaded the file again and have installed.
In localhost with joomla 2.5 works again, I do not want to update web as it is running.
Besides I am creating in localhost joomla upgrade to version 3 for later upload to web and replace version 2.5

But in version 3 of localhost now I get an error 1054 with the following.
It is this version q interests me.

Thank you.

Unknown column 'order_serial_params' in 'field list' SQL=INSERT IGNORE INTO `ce9uj_hikashop_order` ( `order_user_id`,`order_status`,`order_shipping_address_id`,`order_billing_address_id`,`order_currency_id`,`order_currency_info`,`order_type`,`order_full_price`,`order_tax_info`,`order_shipping_price`,`order_shipping_tax`,`order_payment_price`,`order_payment_tax`,`order_discount_tax`,`order_discount_price`,`order_payment_id`,`order_payment_method`,`order_created`,`order_ip`,`order_modified`,`order_serial_params` ) VALUES ( '3','created','6','6','1','O:8:\"stdClass\":4:{s:13:\"currency_code\";s:3:\"EUR\";s:13:\"currency_rate\";s:7:\"1.00000\";s:20:\"currency_percent_fee\";s:4:\"0.00\";s:17:\"currency_modified\";s:10:\"1447550356\";}','sale','97.93892','a:1:{s:9:\"IVA (21%)\";O:8:\"stdClass\":3:{s:11:\"tax_namekey\";s:9:\"IVA (21%)\";s:8:\"tax_rate\";s:7:\"0.21000\";s:10:\"tax_amount\";d:16.379999999999999005240169935859739780426025390625;}}','0','0','3.55892','0','0','0','1','paypal','1448930721','','1448930721','{\"order\":[],\"product\":[],\"order_product\":[],\"serial\":[]}' )

Indeed this seems to have been the problem has been fixed.
Thank you