Linked Questions

1 vote
1 answer

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'...
Hamid Pishbin's user avatar
1 vote
0 answers

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 ...
Omar Sangines's user avatar
0 votes
0 answers

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.
Álî Ali's user avatar
0 votes
0 answers

"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 ...
Roeland's user avatar
71 votes
6 answers

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 ...
Tetsujin's user avatar
  • 117k
39 votes
8 answers

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 ...
mhaselup's user avatar
  • 645
15 votes
3 answers

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 ...
Masoud's user avatar
  • 325
6 votes
4 answers

Failed to upgrade to OS X High Sierra with two non-descriptive errors

I've downloaded "Install macOS High" from the Apple App Store. On launching I get: "This copy of the Install macOS High application is damaged, and can‘t be used to install ...
Sasc's user avatar
  • 71
2 votes
1 answer

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 ...
Eugenio's user avatar
  • 167
0 votes
2 answers

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
Janet Madrid's user avatar
1 vote
0 answers

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 ...
andrew liev's user avatar
1 vote
0 answers

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 ...
Stevo's user avatar
  • 11