@moaaz it disables some protections, but this is not permanent.

The first step (SIP) can be re enabled via the command " csrutil enable " in terminal while in recovery mode once you’re done installing.
The second step (read only bypass) is reactivated automatically once you reboot your computer.

That being said, do this at your own risk (as stated in the video).

cheers.

Hello @zareen

I’ve found a way to force the installation of older packages on Catalina, maybe give it a try :

cheers.