I uninstalled version 1.3, the immediately installed version 1.4. I got the error message below:

Package installation status:

Custom table 'Standard Values' created via Package Action

Error in installing Application Tree for the Standard Values package:
umbraco.DataLayer.SqlHelperException: Umbraco Exception (DataLayer): SQL helper exception in ExecuteNonQuery ---> System.Data.SqlClient.SqlException: Violation of PRIMARY KEY constraint 'PK_umbracoAppTree'. Cannot insert duplicate key in object 'dbo.umbracoAppTree'. The statement has been terminated. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) at umbraco.DataLayer.SqlHelper`1.ExecuteNonQuery(String commandText, IParameter[] parameters) --- End of inner exception stack trace --- at umbraco.DataLayer.SqlHelper`1.ExecuteNonQuery(String commandText, IParameter[] parameters) at umbraco.BusinessLogic.ApplicationTree.MakeNew(Boolean silent, Boolean initialize, Byte sortOrder, String applicationAlias, String alias, String title, String iconClosed, String iconOpened, String assemblyName, String type, String action) at Sitereactor.StandardValues.Installer.InstallationHelper.InsertApplicationTree()