Delete big sur pkg

I downloaded big sur but was unable to install because I don't have the space. However, the useless installer package is now taking up all my space. Mac won't let me delete it. I've tried right clicking and there's no delete option and you can't drag to the trash. Any ideas for how to get rid of it since I'll have to stick with Catalina?

Why did they make macbooks with so little space several years ago?!