That column that it is mentioned in your error, status_author _id, is not part of default 4.6.9 database a.f.a.i.k. So it must be either from a third plugin/app or from the 3.1.x versions.
Can you check the database and see if it is added by a custom third party or it is part of Ipb 3.1.x.
If the former, disable all your third party plugins/apps and give the upgrader another go.
If the latter, I would recommend to do the upgrade in steps. Menaing upgrade first to the very latest version of 3.x version and then upgrade to 4.6.9.