Direct link to download for big sur I'm looking for a way to download Big Sur installer to an external drive. I am trying to create a backup-USB installer - so I can replace my 128 ssd with a larger one.  I don't have enough space. I backed up with time machine, but still cannot manage to delete enough space (128 gb is literally nothing nowadays).
Is there a place to directly download the installer so I can copy the installer to an external drive?
Download installinstallmacos.py from either:
https://github.com/munki/macadmin-scripts
or
https://github.com/grahampugh/macadmin-scripts
Follow the instructions and you can get a regular DMGs.