As per FAQ, you can avail only one voucher irrespective of how many learning path you complete. reference https://community.databricks.com/t5/databricks-academy-learners/faq-for-databricks-learning-festival-virtual-10-july-24-july/m-p/71721
yes, you need to first click on the customer and prospect link.. it will ask you to create account so it can record your learning journey.. and then you can access the learning path which you are interested in…Hope this helps !