Can't update to 6.0.23421.0 "specified account already exist"

Initial setup
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Hello Andrey,
I believe there must have been an error while downloading the installation file.
Please fully uninstall eM Client.
Download the latest release manually > http://www.emclient.com/dist/v6.0.234…
Try installing again.

Best regards,
Olivia

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Thank you, Olivia. )