Hello Zahid,
The CC430F6137_RGC_64.bxl is located on the CC430F137 TI product folder (http://www.ti.com/product/cc430f6137). I have also included the bxl file here for convenience (Please visit the site to view this file). This file can be translated to Altium using the free UltraLibrarian software also located in the ti product folder or http://webench.ti.com/cad.
Regards,
Janet