I think you're missing what I meant:
PHP Code:
PHP Fatal error:  1054:Unknown column 'is_guest_order' in 'field list' :: UPDATE orders.... 
It looks like there is a missing column in the orders table. That is what this error message is telling you. "Unknown column 'is_guest_order'"

Sometimes the logs can be confusing and it would be nice if there was a "basic log" showing just the error and a "complete log" such as it currently is. While it's good to be able to back trace where the error is being called from, the chain of events, it can also be perhaps "too much information" for many regular (non-developer) users when all they need is that last line of the log showing the actual error.

So, in the interest of helping you get a better understanding of what's occurred, do you have more insight into the issue? Just from what that bit that I pasted above is saying. I do not know why this is happening in terms of upgrading from a lower version, and Cindy is the best person to address it moving forward, but you can remedy this so you can progress with your site update once you see what the error is telling you.