i downloaded the unarchiver but couldn't find a way to "open with." however, my issue is that i keep getting this message, which wasn't mentioned in that thread. clicking on the ? tells me how to change the permissions, but i've already given myself the highest permission and it won't work. for reference, i have the second most recent big sur update i believe
![](https://img.itch.zone/aW1nLzYxOTY3NjIucG5n/original/ZlPwrq.png)