If you are looking for certificates for your team members who finished the course quite a while ago (i.e. their course access has ended), there are two ways: either look at all the trainees or search for one trainee.
Viewing all trainees and downloading certificates
Go to Manage > Trainees and courses, then click on Options > Expired/deleted trainees (or simply click on the number in the Expired/deleted trainees column).
You'll then see a list of all the trainees that have had access to that course. Click on Options > Certificate.
Searching a single trainee and downloading the certificates
In any search box, start typing the name or username of a trainee, then click on the name as it pops up.
When the results show, use the Options menu to download the certificate.
