If you do upgrade in Remote Upgrade Tool 5.x.x: You removed these folder/files
catalog/model/total catalog/model/payment catalog/model/shipping catalog/model/feed catalog/controller/module catalog/controller/payment admin/controller/module admin/controller/payment admin/controller/shipping vqmod/vqcache/all files vqmod/xml/expired xml-files system/storage/modification all files (if do upgrade from Oc 2.1|2.2)
Option: before upload you can rename folders catalog to catalog-2, system to system-2, admin/controller to controller-2 etc. and then upload Opencart 2.3 files.
IMPORTANT In your store must not be hidden files, eg. file .D_Store in folders 'payment', 'shipping', 'total', 'feed', 'module', 'farud', 'dashboard','analytics' and 'captcha'. When upgrade do to version 126.96.36.199, these folders deleted. Php is not found hidden file (it is not can remove file .D_Store) and folder removal can not be done, it do issue.