Hi, Is there any free version of Cubase 12?
There is not.
There are bundled versions available, that are free of extra charge.
Bundled with hardware.
Free Willy 
There’s always the option to buy a used Cubase version. It doesn’t have to be the most recent version right away. You can update/upgrade anytime.
Knobcloud.com is a good place to buy used Cubase versions for little money.
Welcome to the forum 
I didn’t realise it could be legally sold second hand. How is the license transferred to a new owner?
It’s a safe transaction if you follow Steinberg’s guidelines:
You’ll also find this link on knobcloud. It’s nothing unusual and sometimes you’ll find yourself a real bargain.
Cubase Elements is a very good deal. It’s all I use and have used for years.