A course can have two ways to download your certificate. You can either go to  your Profile (in the top right corner) > Certificates or you will see the course certificates as part of the course by scrolling down the modules of the course.  You will only see the certificate unlocked after all the course contents have been completed in full.  If any area is skipped or not completed in full the certificate will not unlock.  It does take a few moments to process so be patient. The certificate can be downloaded on your computer in the file - Downloads.  This does take a few minutes.  Do not close the course until you see the download.