1 Answer. iOS installer files (IPSWs) can be safely removed. IPSWs are not used as part of the backup or backup restore procedure, only for iOS restore, and as you can only restore signed IPSWs the older IPSWs can’t be used anyway (without exploits).

What happens if you delete iOS installers?

It is safe to delete, you will just be unable to install macOS Sierra until you re-download the installer from the Mac AppStore. Nothing at all except you would have to download it again if you ever need it. After install, the file would usually be deleted anyway, unless you move it to another location.

Do I need to keep iOS installers?

is there any reason to keep iOS installers in my MacAir hard drive? Answer: A: Answer: A: no, you can get rid of them.