you have to select in the download portal "all Versions". This ist the big grey button on the right everyone is looking for.
Have you used this user to install Extensions into EPO?
if you had to change the user account connecting to sql when this started, as you said, are you sure that new user account has appropriate permissions to the database? Does it have the same permissions the old account had?
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have you opened a support ticket? I think it is hard to find a solution for you, because there can be so many different errors. Support will to a remote session to look directly on your EPO Server.