Getting started. Installing and upgrading nopCommerce.

I am on version 3.10 and want to upgrade to 3.7.

There are many code changes i have done in .cs files in order to accommodate customers requirement.

How i should proceed for upgradation  ,without losing my any customised functionalities.

Please help ASAP -- Thanks in advance

@[email protected] I have upgrade the nopcommerce version from 2.7 to 3.4. I also changed the default code I mean the core source code.

What I did for update nopcommerce. Run db script from 2.7 to 3.4 and then change the code accordingly.

You can get the db script from https://github.com/nopSolutions/nopCommerce/tree/develop/upgradescripts

We just upgraded from 3.4 to 3.7
We began experiencing 2 frequently with multiple customers after upgrading to 3.7
The errors do not occur with all customers but enough so that our client's customer service dept. is getting buried.

Error 1 Object reference

Error while placing order. Error 1: Object reference not set to an instance of an object.  7/4/2016 5:38:07 PM

Error 2 Duplicate transaction entry

Error while placing order. Error 1: Payment error: Error #E00027: The transaction was unsuccessful.. Error 2: Payment error: Error #11: A duplicate transaction has been submitted.

Why dont you make instructions for upgrading no-source nop-commerce from 3.9 to 4.0; no information at all

I recently tried to upgrade from 2.9 to 4.2.  I had 10 nop websites that needed upgrading.  Getting error upon error, i got some help from fellow nop user named Saurabhdhi.  He helped me through a few of the first errors.  I eventually just had him to the complete upgrades on all 10 sites.  He was amazingly cheap, fast and thorough.  He even upgraded my plugins.

Go see saurabhdhir you can PM him from here for help or even have him do it.:

https://www.nopcommerce.com/boards/topic/67663/availability-of-paypal-direct-plug-in-in-nopcommerce-420