In reply to Moshiur Rahman.

SAS/STAT 14.1 was released as part of SAS 9.4m3 software. (For a table that connects each SAS/STAT release to the corresponding version of SAS, see the article "How old is your version of SAS?") You cannot just add the GLIMMIX feature to your current release. You would need to upgrade to SAS 9.4m3, which would give you that feature and many others.