Hi, Paul,
We need a bit more information to help you on this.
1) can you try this command and get the value of this parameter from your DBTUNE?
sdedbtune -o list -u sde -k DEFAULTS -P XML_IDX_INDEX_TEXT -P ... -i ...
If you see its value like this, "TABLESPACE (any_name)", remove the config_string for the XML_IDX_INDEX_TEXT parameter in the DEFAULTS keyword from the DBTUNE table, and try upgrade again.
2) if it is not the case, please attach your sde_setup.log. It can find it in your system TEMP directory.
Thanks
Eugene