the certification rpa developer advanced is always free ???
The legacy, free Advanced RPA Developer certification is available but will retire after 30 April 2020 and the certificate will expire in 1 year. You may want to consider getting certified in the new UiPath Certified Professional program, please click here for details.
You can get more detail on this thread:
You can check my last post here on this topic. Advanced UiPath Free Certification Date extension