I just re-uploaded the admin files. OPC is turned to FALSE. I go to the orders page - which is blank with the error and get the following adm file

Also -this is a pretty "vanilla" site with only a couple of mods.

HTML Code:
[22-Jul-2020 17:23:24 UTC] Request URI: /catalog/2020/index.php?cmd=orders, IP address: 162.72.107.178
#1  trigger_error() called at [/home/afamblck/public_html/catalog/includes/classes/db/mysql/query_factory.php:170]
#2  queryFactory->show_error() called at [/home/afamblck/public_html/catalog/includes/classes/db/mysql/query_factory.php:142]
#3  queryFactory->set_error() called at [/home/afamblck/public_html/catalog/includes/classes/db/mysql/query_factory.php:269]
#4  queryFactory->Execute() called at [/home/afamblck/public_html/catalog/2020/includes/classes/observers/OnePageCheckoutAdminObserver.php:58]
#5  OnePageCheckoutAdminObserver->update() called at [/home/afamblck/public_html/catalog/includes/classes/class.base.php:118]
#6  base->notify() called at [/home/afamblck/public_html/catalog/2020/orders.php:1253]
#7  require(/home/afamblck/public_html/catalog/2020/orders.php) called at [/home/afamblck/public_html/catalog/2020/index.php:11]
--> PHP Fatal error: 1054:Unknown column 'is_guest_order' in 'field list' :: SELECT is_guest_order
                           FROM zen_orders
                          WHERE orders_id = 4582
                          LIMIT 1 ==> (as called by) /home/afamblck/public_html/catalog/2020/includes/classes/observers/OnePageCheckoutAdminObserver.php on line 58 <== in /home/afamblck/public_html/catalog/includes/classes/db/mysql/query_factory.php on line 170.