You were also missing the END that matched the opening BEGIN. If you do not plan on doing any custom error handling, e.g. enriching the error message, in the trigger then I would recommend completely removing the TRY/CATCH and go with something simple like this:

USE DEV2

GO

CREATE TRIGGER [dbo].[RPT_Trans_Audit] ON [RPT_Trans]

AFTER INSERT, UPDATE, DELETE

AS

BEGIN

SET NOCOUNT ON;

INSERT INTO [dbo].[RPT_Trans_Audit]

(

Package_ID,

Received_Date,

Download_Date

)

SELECT Package_ID,

Received_Date,

Download_Date

FROM INSERTED;

END

GO