As I said, Apple no longer ties installers. Meaning Sierra and High Sierra are not tied to it.if i go to purchased on my app store i do see mountain lion and it allows me to download it.
@Fishrrman I am in the exact same situation as the OP. I have been working tirelessly to figure this out (I had taken similar, but not exact steps as you mentioned above - instead I had backed up the High Sierra version of my MBP's SSD to Time Machine as instructed on another website - so I might go back and do your version anyway, but I digress.)I'll try to help.
The OP has learned a hard lesson.
He didn't backup.
Now he can't "get back to where he once belonged".
Not without a lot of trouble, anyway.
OP: here's what you need to do.
You must read and follow ALL of these instructions.
First, you need to create a backup of your internal drive (to preserve your account, apps, and data).
You'll need an external hard drive (can be USB, platter-based drive, SSD, anything).
You'll need to download CarbonCopyCloner (or SuperDuper). Either is FREE to download and use for 30 days.
Get the above.
Then connect the external drive.
Run CCC and create a cloned backup of what you have now.
Make it an "HFS" backup (so you can mount it on older versions of the OS)
Then let CCC "do its thing".
Set this backup aside for the moment.
You'll need a USB flashdrive 16gb or greater.
Initialize it to HFS+ with journaling enabled
You'll need one of the following (all are free to download):
- Boot Buddy
- Install Disk Creator
- DiskMaker X
You'll need a copy of the Low Sierra installer
Use one of the apps above to create a BOOTABLE version of the Low Sierra installer on the USB flashdrive.
DO NOT DO THIS UNLESS YOU HAVE BACKED UP AS ABOVE!
Boot from the bootable USB installer.
Go to Disk Utility
ERASE your internal hard drive -- set it HFS+ with journaling enabled
Now the internal drive is reinitialized to HFS with nothing on it, ready to install a brand-new copy of the OS.
Install Low Sierra onto the internal drive.
When done, it will reboot into the new install.
Begin the setup.
At the appropriate moment, setup assistant will ask if you wish to migrate stuff from the old Mac or drive.
Connect the bootable backup you made earlier and "aim" setup assistant at it.
See if you can set it up to migrate apps, accounts and data.
WARNING: this may or may not work, because you're trying to migrate from a volume "newer than" Low Sierra.
If this doesn't work, DON'T DESPAIR. There are other methods around this.
See if the migration will "go through".
If it does, good.
If it doesn't, ignore the external drive.
Set up a "basic account" but DO NOT use the username and password that you normally use, instead use something like "temp" (this will be fixed later).
Then, get back to us.
You've got some work to do, son, if you want to "get back"...
It is possible to install using the older file formay. See the complex instructions below, which you may have to edit to fit your usage case.@Fishrrman I am in the exact same situation as the OP. I have been working tirelessly to figure this out (I had taken similar, but not exact steps as you mentioned above - instead I had backed up the High Sierra version of my MBP's SSD to Time Machine as instructed on another website - so I might go back and do your version anyway, but I digress.)
In any case, just as I was about to reformat my internal SSD, I realized that I cannot format my SSD as HFS+ anymore - only the APFS options are available.
Is there another step in there to get back to HFS+ for the older versions? I am beyond frustrated right now as the only reason I'm downgrading is because High Sierra "broke" my 2nd external monitor connection on DisplayLink.
OR ... can I possibly just restore the Time Machine HS backup to my MacBook Air (which I was switching to anyway, longer story) which is still running Sierra?
Thanks much in advance for the use of your brains ...
See this article for reversion to HFS+ https://www.techrepublic.com/article/how-to-revert-back-to-apples-hfs-from-apfs/ Note that the text typed in the article is incorrect for the command, the screenshot of terminal is accurate.
Thank you for this. I am getting an error that says the "volume OWC 1.0TB couldn't be unmounted because it is in use by process 0 (kernel)"
I never made any partitions on the drive (I'm no techie, indeed) - is that the problem here? I'm really out over my skis on this from a knowledge standpoint so your assistance is much appreciated.
For some reason when I enter Internet Recovery my only option is to re-install High Sierra with APFS formatting.I've successfully downgraded my 2017 iMac and MacBook 12" to macOS Sierra (the version they were originally supplied with).
1. Backup everything you need to.
2. Reboot holding down Cmd+Option+Shift+R to enter Internet Recovery mode.
3. Wait for it to download the installer. This should be the original version that was installed on your computer (Sierra in my case).
4. Once the installer starts, open up the Terminal via the menu and delete any APFS volumes and containers using "diskutil". This will replace the APFS partition (if you have one) with a nice HFS+ one.
5. Quit Terminal and reinstall in the usual way. It was quick on my iMac, but the MB took a while.
My main reason for downgrading was issues with Spotlight, which basically made it useless.
Very old post. Apple didn’t offer a link back in October.