Download High Sierra

[zalle]

Hi guys,

I own a late 2012 iMac with Sierra. I've done update to Mojave, but went back due to compatibility issues.

I have a Logitech G13 keypad (https://www.pcmag.com/review/307656/logitech-g13-advanced-gameboard)
and I use it to edit in Lightroom and FCPX.

I installed Mojave, but the G13 wouldn't work. I upgraded the G13 driver and it just crashed every single time. Contacted Logitech and they replied "upsss... sorry about that...", so I'm hoping High Sierra can handle it.

Unfortunately the High Sierra copy I have in my mac does not install (says it's damaged).

Is there a place I can get High Sierra to install?

Maybe I could get another keypad that works in more recent OSX versions? I'll write another post on this I guess...

Thanks

 

[Passingby]

Might work...link at the bottom

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

 

[zalle]

Thanks, I'm downloading that one as I write, but the non working copy came from this link as well, hopes are not that high...

 

[CoastalOR]

OP:
If your High Sierra installer was downloaded before 24 Oct 2019 then it has an expired certificate and appears damaged when trying to use it. Here is a MacRumors post I made about the symptoms and a workaround:

macOS 10.12.6 full installer with valid certificate?

If this is what you are seeing then it is because it is a version that has a expired certificate: Either download the latest version with the updated certificate and create a new USB installer: https://support.apple.com/en-us/HT208969 or Change the date with your current High Sierra USB...

forums.macrumors.com

The link posted by @Passingby should work for you to download High Sierra with an updated certificate. Apple updated the App Store download of High Sierra.

EDIT: MacRumors article about the problem:

How to Fix a Damaged macOS Installer

Creating a macOS installer on a bootable USB drive provides a convenient way of installing a fresh copy of macOS on multiple Macs, and also allows you to perform a clean installation quickly and easily. If you tried to run your installer recently and unexpectedly received an error that it is...

forums.macrumors.com

 

[Fishrrman]

Try this (no promises):
- go to the date & time pref pane and DISABLE "set date and time automatically" (uncheck it)
- SET THE DATE BACK to January 31, 2017.
- Reboot and try the installer again.

 

[zalle]

Thanks guys, it's installing now!

 

[zalle]

Done!