Activation did not work, apps asking for serial number

Started a trail of a number of CC apps.  When trial ran out, I purchased the monthly full suite service.  All of my apps now require signing in, which results in an unrecognised serial (which I don't even get a chance to enter) and then asks for me to enter in a serial, which I have never been given.  My understanding is that CC does not use serials, only my AdobeID.

OK, so I started going though these things and got stuck here:
Log in as an administrator to edit the hosts file in Mac OS.
In a Finder window, choose Go > Go To Folder.
Type /etc.
Select the hosts file and open it.
Back up the hosts file: Choose File > Save As, save the file as hosts.backup, and then click OK.
Search the hosts file for entries that reference activate.adobe.com (for example, 127.0.0.1 activate.adobe.com) and delete these entries.
Save and close the file.
Number "c." just says "select the hosts file"  without telling you what the hell the hosts file is!!!  And I cannot find anything there to do with Adobe

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