And this is completely fine. But:

1. If you’re talking about Big Sur installer, you can verify that it’s an outdated Beta 1 installer from Apple’s servers
2. If you’re talking about patch from macrumors, there is source code in the archive
3. If you’re talking about my installation script, there are steps for manual install in this article and full source code for it available on github

I’m also decided to wait for ARM devices to update my 2012 mini and 2015 air, so, we’ll see when it arrives.