I downloaded another copy of the latest Moodle 3.3.6 files about a week and a half later and the site updated without a hitch. This no longer seems to be an issue. Thank you for your response, I really appreciate it!
Installing and upgrading help
dmlreadexception error while upgrading from 3.3.5 -> 3.3.6
This discussion has been locked because a year has elapsed since the last post. Please start a new discussion topic.