It looks as though this instance failed at validation, so it is unlikely to have been upgraded.
Do the WEBMERC.IMG_FP, WEBMERC.MISSIONS_FP, WEBMERC.MISSIONS_FP_Simplified93_5M,
S_CSCDATA.IMG_FP, and S_CSCDATA.MISSIONS_FP tables exist in the database? If not, they
were likely deleted in a way that corrupted the geodatabase table registry.
The easiest way to address nominal corruption like this is to create tables of the same owner
and name (no need for more than a single INTEGER "objectid" column), then use ArcGIS to
delete the tables (and their metadata entries). Once this is done, validation should succeeed,
and then the instance wil be viable for upgrade.
- V