Giveaway is 3.57 and portable version is 3.57 too.
However, the latter doesn’t want the provided serial key.
Serial keys must work, no matter it’s a full or a portable version.
Useless junk went to trashcan.
I am unsure in what world you believe that “Serial keys must work, no matter it’s a full or a portable version.”! The publisher decides what they are offering and in this case, they are giving away the installed version and not the portable version.