Error message on upgrade installation of 2.50

I have a running site for 2.40, and had Arvixe run the upgrade script over my database to move to 2.50.
Once I try to "install" the new version, I get the following error message...

Setup failed: System.InvalidOperationException: Sequence contains more than one element at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source) at System.Data.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__3[TResult](IEnumerable`1 sequence) at System.Data.Objects.ELinq.ObjectQueryProvider.ExecuteSingle[TResult](IEnumerable`1 query, Expression queryRoot) at System.Data.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[S](Expression expression) at System.Data.Entity.Internal.Linq.DbQueryProvider.Execute[TResult](Expression expression) at System.Linq.Queryable.Single[TSource](IQueryable`1 source) at Nop.Services.Installation.InstallationService.InstallSettings() in f:\Own\NopCommerce\Sources\src\Libraries\Nop.Services\Installation\InstallationService.cs:line 4543 at Nop.Services.Installation.InstallationService.InstallData(String defaultUserEmail, String defaultUserPassword, Boolean installSampleData) in f:\Own\NopCommerce\Sources\src\Libraries\Nop.Services\Installation\InstallationService.cs:line 9428 at Nop.Web.Controllers.InstallController.Index(InstallModel model) in f:\Own\NopCommerce\Sources\src\Presentation\Nop.Web\Controllers\InstallController.cs:line 429


Any thoughts would help !

FLETCH

creativeventures wrote:
https://www.nopcommerce.com/boards/t/10620/200-beta-install-error-new-rev-existing-db.aspx

creativeventures wrote:
You don't have to install nopCommerce during upgrading. Have a look at this article.