Linked Questions
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How to change timezone in recovery mode? [duplicate]
I have a MacBook pro and I'm trying to instal OS X El Capitan on a clean formatted SSD hard drive. While installing I encounter an error saying "this copy of the instal os x el capitan application can'...
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I have a mid 2009 MacBook Pro still on its original software cant upgrade [duplicate]
Help me please!!! I have a mid 2009 MacBook Pro running Mac OS X Version 10.7.5 it won’t let me update it to anything I tried El Capitan Sierra, high Sierra and nothing I don’t have a disk slot on ...
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"Failed to open OSinstaller" on re-install MacOS [duplicate]
Running into a problem that says "Installer information on the recovery server is damaged" when trying to re-install MacOS (Sierra) on Macbook Air 2017. Most tutorials/"fixes" on ...
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iMac mid 2007 verification error during install OS X El Capitan [duplicate]
The error comes on iMac mid 2007 and I didn't get sufficient replies or successful method after seeing above mention posts.
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6
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How can I download an older version of OS X/macOS?
Sometimes it's hard to search for older / previous versions of macOS & OS X on the App Store or Apple web site since they change links to promote the newest shipping version.
This is an attempt to ...
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How do I create El Capitan installer on a Catalina (or post-El Capitan) installed Mac for use on USB boot installer?
I have downloaded the El Capitan DMG file (InstallMacOSX.dmg) provided by Apple. The expanded DMG image contains the package "InstallMacOSX.pkg" which should be run to create the El Capitan ...
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3
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This copy of the Install OS X Yosemite application can’t be verified. It may have been corrupted or tampered with during downloading
Sorry if my question is easy because I am new to Mac.
OS X Yosemite on my friend's Macbook Air was removed. Now when we start his Mac it has just Windows.
For installing Os x, I got the the ...
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4
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Failed to upgrade to OS X High Sierra with two non-descriptive errors
I've downloaded "Install macOS High Sierra.app" from the Apple App Store. On launching I get:
"This copy of the Install macOS High Sierra.app application is damaged, and can‘t be used to install ...
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1
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Installing old OS X version and the "It may have been corrupted or tampered" message that can't be fixed by changing the date
I am trying to install OS X Yosemite on a dedicated partition of a MBP 13" mid 2012 running Catalina (I need dual boot).
I downloaded the file from the official Apple page and followed these ...
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2
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How do I get El Capitan to install from a usb installer
I tried to perform a clean install for Mac Pro El Capitan. The app store said it was unavailable so I purchased a bootable usb installer but it won't install. What do I need to do
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MacBook Pro 4.1, can't install OSX Yosemite or El Capitan
I have a MacBook pro 4.1 (17 in, mid 2008), and for the life of me I can't get MacOS Yosemite or El Capitan to install. I would like to get El Capitan on the machine, as it is the newest version of ...
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MacBook Pro 2015 won’t boot to Operating System. Constantly restarts at Apple logo screen
I have tried all the obvious commands at boot without success, including Safe Mode. Then booted into Single-User mode. Ran “fsck -fy” command. Shows 9 line item warnings: “time stamp is invalid. Is ...
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