If you are unable to download the certificate and the portal throws an error "Error! Try to reload/relogin to download", then kindly follow the instructions given below.
This error is very rare, please do not worry about it.
Login again to your account or use a different browser or use incognito mode and try to download. It works.
If you have a poor internet connection then please wait, all of the digital certificates are large around 10 - 20 MB, They might take some time to be loaded fully, kindly wait.