Thanks for the help.
Same product, new problem :
ReadMe instructions say "Patch Host File" and register.
Clicking the "Patch Host File" button crashes the Kengen app. Meanwhile the generated serial produces the message "not valid for this product".
For info, this is what the host file contains:
127.0.0.1 localhost
127.0.0.1 activate.adobe.com
127.0.0.1 3dns-3.adobe.com
127.0.0.1 adobe-dns-2.adobe.com
127.0.0.1 adobe-dns-3.adobe.com
127.0.0.1 ereg.wip3.adobe.com
127.0.0.1 activate-sea.adobe.com
127.0.0.1 wip3.adobe.com
127.0.0.1 wwis-dubc1-vip60.adobe.com
127.0.0.1 activate-sjc0.adobe.com
127.0.0.1 practivate.adobe.com
127.0.0.1 ereg.adobe.com
127.0.0.1 activate.wip3.adobe.com
127.0.0.1 3dns-2.adobe.com
127.0.0.1 adobe-dns.adobe.com
::1 localhost