USB Intallation !!!

[frilli]

Hello everyone, sorry for my bad english !!!
where can I find the installation files of the various apple operating systems to create a bootable usb stick?
I will have downloaded 100 copies, including Yosemite, Sierra, High Sierra, Mojave etc ..... all expired copies, how can I solve?

 

[Fishrrman]

Use DiskMaker X to create the USB flashdrive:

Downloads

diskmakerx.com

If the Mac still won't boot to the USB, it could be a "date/time" issue (expired certificate).
Fix it this way:
1. Open date & time
2. TURN OFF option to "set date and time automatically"
3. Set the date back to January 1, 2017
4. Close system preferences and REBOOT THE MAC.
5. Let the Mac reboot, and check to see if the date is now "set back".
6. If it is, SHUT DOWN the Mac, all the way off
7. Insert the USB flash drive and try rebooting again. Then try to install the OS.

 

[gilby101]

Apple Download pages with download links with new certificates:
Mojave (via App Store)
High Sierra (via App Store)
Sierra (Disk Image, direct)
El Capitan (Disk Image, direct)

For other versions you may need to resort to the date change trick.

 

[frilli]

Apple Download pages with download links with new certificates:
Mojave (via App Store)
High Sierra (via App Store)
Sierra (Disk Image, direct)
El Capitan (Disk Image, direct)

For other versions you may need to resort to the date change trick.

Thanks for the reply, I would need Yosemite for the installation of a 24 iMac .... I tried with the date trick (I tried from 2015 to 2017) but nothing gives me this message: I can't verify this copy of the Application Installing OS X Yosemite. The copy may have been damaged or altered during the download.

Should I fix this iMac for a customer and I don't know how to do it, I've been stuck for a month ..... are there other solutions, since this iMac supports Yosemite to the maximum?

Sorry for my bad english !! Thanks

 

[CoastalOR]

Thanks for the reply, I would need Yosemite for the installation of a 24 iMac .... I tried with the date trick (I tried from 2015 to 2017) but nothing gives me this message: I can't verify this copy of the Application Installing OS X Yosemite. The copy may have been damaged or altered during the download.

Should I fix this iMac for a customer and I don't know how to do it, I've been stuck for a month ..... are there other solutions, since this iMac supports Yosemite to the maximum?

Sorry for my bad english !! Thanks

You can download Yosemite dmg using this Apple instruction.

How to download and install macOS - Apple Support

Download and install current or previous versions of the Mac operating system on compatible Mac computers.

support.apple.com

 

[frilli]

You can download Yosemite dmg using this Apple instruction.

How to download and install macOS - Apple Support

Download and install current or previous versions of the Mac operating system on compatible Mac computers.

support.apple.com

Tried .... nothing, same error message, how can I solve....!?!....that you know the iMac 24 supports the restore with ALT-CMD-R key for last system restore? I tried with a Windows keyboard but it doesn't work, will that be ??