I just went to install this. I run many DotNetNuke versions, and successfully install a fresh installation of 5.2.2 in exactly the same location as 5.4.  However, on a fresh installation of 5.4 I get this error on  a later stage of the installer.  I got an error before this one which redisplayed the form with an error message. When you submit the form again you get this error.

Violation of UNIQUE KEY constraint 'IX_PortalAlias'. Cannot insert duplicate key in object 'dbo.PortalAlias'

There is no way out of this, and if you then request your site it works but there is no content.

I've been using DotNetNuke for years and years and host many sites - this is the software not me. Back to a previous version I go....

:-(

Well I recycled the web app, deleted the files and pasted 5.2.2 files in it's place and everything worked fine. Maybe there is some pre-requisite that 5.4 needs that 5.2.2 doesn't? But if not all fingers point to the DotNetNuke installer...

i have same problem with error, there is no same name portals

System.Data.SqlClient.SqlException: The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_PortalLocalization_Portals". The conflict occurred in database "mydb", table "dbo.Portals", column 'PortalID'.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at DotNetNuke.Data.SqlDataProvider.ExecuteADOScript(String SQL)
at DotNetNuke.Data.SqlDataProvider.ExecuteScript(String Script, Boolean UseTransactions)



/* Add Foreign Key to PortalLocalization Table */
/***********************************************/

IF NOT EXISTS (SELECT * FROM dbo.sysobjects WHERE id = object_id(N'FK_PortalLocalization_Portals') AND OBJECTPROPERTY(id, N'IsForeignKey') = 1)
BEGIN
/* add key and cascade delete rule */
ALTER TABLE dbo.PortalLocalization
ADD CONSTRAINT FK_PortalLocalization_Portals
FOREIGN KEY ( PortalID ) REFERENCES dbo.Portals ( PortalID ) ON DELETE CASCADE
END

what to do, can i run this script via sql  again ?