macOS High Sierra osishelperd: Failed to mount outer dmg
Hi Everyone,
Who can help me fix the error when upgrade to macOS High Siera.
Thanks JayTay
I have downloaded three times and after then install successful 🙂
3 replies
I can't help but I have the same issue, it may be worth you trying some of the suggestions posted in my thread at Unable to install High Sierra - "an error occurred while preparing the installation"
Could anyone help me !
macOS High Sierra osishelperd: Failed to mount outer dmg