Unable to upgrade Sydney Pro on word press site

I’m unable to upgrade my Sydney pro theme on my word press site

I get this message

Please advise

Hello,

First thanks for using our theme Sydney Pro!

Unfortunately, we couldn’t see the message you mentioned in your post here. Seems to be empty.

But, please refer to this documentation link about how to upgrade from Sydney to Sydney Pro:

We hope this helps!

Please try that and let us know if you need further assistance.

Kind Regards,

Rodrigo,

aThemes Support