Hi,
That is very strange. Maybe you can solve it by chopping this part out of the /Setup/applications/mojoportal-core/SchemaUpgradeScripts/mysql/2.3.2.0.config file
ALTER TABLE mp_LetterSendLog ADD COLUMN `SubscribeGuid` char(36);
UPDATE mp_LetterSendLog
SET SubscribeGuid = '00000000-0000-0000-0000-000000000000';
CREATE INDEX idxSendLogsGuid ON mp_LetterSendLog(`SubscribeGuid`);
ALTER TABLE mp_LetterSendLog ADD COLUMN `SubscribeGuid` char(36);
UPDATE mp_LetterSendLogSET SubscribeGuid = '00000000-0000-0000-0000-000000000000';
CREATE INDEX idxSendLogsGuid ON mp_LetterSendLog(`SubscribeGuid`);
but I do not understand how that column could already exist in your installation as it does not exist in any previous script.
Since it is trying to run the script I think you can ignore th warning about medium trust as the MySql Connector must be in the GAC. It may be best to delete the MySql.Data.dll from the bin folder if it is using the one from the GAC.
Hope it helps,
Joe