There were no info that I don't have an account. Of course I have it since previously I used it.
Please note, that there are plenty of places in documentation that Bandlab Assistant is needed to install Cakewalk Bandlab.
I got the following reply which is helpful from the support:
So, now the official way to install it is to download from the link:
https://downloads.bandlab.com/cakewalk/setup/CakewalkSetup.exe