Installation cannot proceed because the installer is damaged

I am trying to install Sequoia on a 2011 Macbook Pro 8,2 (i7, AMD GPU, 16gb RAM) but when I get to the installer and start with the install it gives me "Installation cannot proceed because the installer is damaged" about halfway through.

I am installing to a fresh SSD with nothing on it and the computer was not running any OS before this, I made the USB installer according to the guide on Legacy Patcher's website.

Any help would be appreciated!