Unable to upgrade (install) CO22 from 21

MacOS 12.2.1 (MacOS 12 is supported for builds up to 12.2 - presumably 12.2.1 or ??)

MacBook Pro M1 Max (no problem in running CO21)

From within CO21 I followed the link to upgrade. Download CO22. Install dmg - replace.

CO opening welcome screen "Show the World" - [Let's get started].

The [Let's get started] leads to CO login page.

Logging in leads to :

Authentication complete

You may now close this window

Closing that window does nothing. And returning to CO only shows the welcome screen "Show the world" - [Let's get started].

I have tried to download CO22 directly from CO page and install to replace excisting CO22 (por CO21?) a couple of times. Same result.

Hence I'm stuck. With no access to CO. Neither 22 nor 21.

What to do?

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