I just updated illustrator beta and it wont open and it says its damaged.

Me too! Tried downloading and opening v30 and v29.9 a number of times but each time they are reported by my Macbook Pro to be "broken and cannot be opened" (M1 Max, Sequoia 15.6.1)

the uninstall and reinstall doesnt work. wont have time to test a restart for a while. 

It can definitely run on that system.

Maybe try again with uninstalling. Probably reboot the computer before you reinstall?