When I am trying to enroll in training it shows me by again option
Did you try to enroll earlier? Please make sure you are logged in to the training.boltiot.com with the same email ID as you used when you bought the course.
Yes was trying many times for enrolling
You can use the email sent to you at the start of the course.
The mail will contain an access course option so that you can log in with out any issues.