'=* ' in Join sql2005 not accept in sql2012

This operator is discontinued after version 2005.

You can still use it by setting the COMPATIBILITY_LEVEL to 80 in SQL Server 2008 R2.

But you can't do it in 2012. There is no way to do this in 2012.
Refer - Outer Join Operator (+) - Oracle to SQL Server Migration[^].

Solution
Instead of this try the ANSI Standard (LEFT OUTER JOIN) like below.
Please use this standard as the non-ANSI standards are discontinued after 2005 and in future versions also.

SELECT *

FROM 
A
LEFT OUTER JOIN
B

WHERE
A.ID = B.ID

Refer - The query uses non-ANSI outer join operators ("*=" or "=*").[^] for examples.