No response in more than several - please help.

I was really hoping I did not have to go that far. When I tried to upgrade I get this, please let me know what I am missing or need to do to get beyond this error. It is crucial that the site this is on has no downtime.

Probing system...
File system permissions ok.
MySQL database connection ok.
database permissions are sufficient to alter schema.
database initial schema already exists.
database core schema is up to date.
1 site(s) found.
This site appears to be running in a secured environment using Medium Trust policy or at least lower than Full Trust.
In order to use MySQL under Medium Trust, The MySQL Connector for .NET must be installed in the Global Assembly Cache on the server. If you see a SecurityException in the error message then the Connector is not installed. You can download the MySql Connector for .NET from here: http://dev.mysql.com/downloads/connector/net/5.0.html

Configuring feature Html Content - 00:00:00.2656250
An Error Occurred:Method not found: 'Boolean mojoPortal.Data.DBModuleDefinition.UpdateModuleDefinitionSetting(System.Guid, Int32, System.String, System.String, System.String, System.String, System.String, System.String, System.String, Int32)'.
Source:mojoPortal.Business
Stack Trace at mojoPortal.Business.ModuleDefinition.UpdateModuleDefinitionSetting(Guid featureGuid, Int32 moduleDefId, String resourceFile, String settingName, String settingValue, String controlType, String regexValidationExpression, String controlSrc, String helpKey, Int32 sortOrder) at mojoPortal.Web.UI.Pages.SetupHome.SetupFeature(ContentFeature feature) at mojoPortal.Web.UI.Pages.SetupHome.SetupFeatures(String applicationName) at mojoPortal.Web.UI.Pages.SetupHome.RunSetup() at mojoPortal.Web.UI.Pages.SetupHome.Page_Load(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)