There is a Notes field on the Recurring Gift Forgiveness object in LCRM. The admin that is performing the upgrade must have this field visible on their profile in order to successfully complete the upgrade. Below are the steps by which this field can be added to admin profiles.
  1. In LCRM navigate to Setup > Create > Objects > Recurring Gift Forgiveness > Notes
  2. Click Set Field Level Security.
  3. Click Visible for the appropriate profiles. (the profile of the admin running the Upgrade)
You should now be able to successfully complete the upgrade process.