Even after the new BA update, Cakewalk only works in demo mode ...
I've never been able to use this program since the day it was released ...
How can free software be limited to a ridiculous authentication system?
Thank you sincerely for the work of Meng, Noel and everyone involved in this project who brought us back our beloved Cakewalk, but this is unacceptable ...
There are more effective ways to "authenticate" free software ...
Many users are in the same situation as me. I sincerely hope that this will be corrected as soon as possible, and I do not mind paying for it, if need be.

Are you sure you have double checked several times proposed methods?
1) you need to confirm your account on BandLab (you had to get an e-mail after registration and use the link in it)
2) un-install everything (Cakewalk and Assistent)
3) disable any anti(?)-viruses, in case you are not using standard MS Defender (many of them are worse then BandLab assistant, to let you believe they are useful, they declare almost random software/sites as "malware", with very complicated procedure for developers to remove that decision).
3) install Assistent
4) use it to install Cakewalk (not running download Cakewalk installer directly).
 
To make it clear. I also think that BandLab Assistent is a crap. But after 2-4 attempts, it normally succeed. After that, you get still the same Platinum engine. It probably revert into Demo mode at some unlucky day (if you let me guess... can be in 2-3 days... when MS release new major Windows update), but as long as BandLab has not made the same crap as Assistent out of Sonar, it can be useful

Eu fiz tudo isso e muito mais ...
Desde o lançamento do Cakewalk by BandLab, tudo que fiz foi tentar, tentar e tentar, mas sempre no modo demo.
Segui todas as orientações da equipe de suporte da Cakewalk, mas sem sucesso.
It is ironic to think that free software is limited to an authentication mechanism.
It would be much more efficient to provide a serial number to registered users on the site and validate that number online.
This is the procedure of most software companies and this works well.