Hello Purushothaman, 

Thanks for posting your query on PSC :)

This is a licensed product.  There is no personal edition, just Pega Robotics Studio.  Contact your Account Executive for further information.  Once you have access to the Support Portal mentioned in this thread you will be able to download it."

Refer the following discussion for more information on this download.

https://pdn.pega.com/community/pega-academy/question/pega-robotics-version-80

Also refer:

https://pdn.pega.com/community/product-support/question/can-you-pls-provide-software-installing-pega-robotic-automation

Regards,

Naveen