Registered eM under a different name than the server, how can I I change it?

Initial setup
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I’m not sure I understand your problem, but maybe…

1.  the email address you used to register eM Client is wrong and you can’t get the license sent to you.  I would re-register (i.e., get a new license) using thew correct email address.or

2.  The email you used to register is different than the email you wish to access in eM Client.  No problem, the email address used to register is completely independent from addresses you wish to access.

Hope this helps.