Linked Questions

5
votes
1answer
72 views

Update to macOS 10.12, but still keeping 10.11 in an external HD

I am still running macOS 10.11, now I wanna update to 10.12, but since some apps must be running on 10.11, so I need to keep this system and here is my plan: I use TimeMachine to backup my system 10....
2
votes
1answer
2k views

How to downgrade to macOS Sierra without Time Machine

I upgraded to High Sierra a week ago, my MacBook Pro 2016 (15 inch) is very slow now even in normal daily usage. I wanted to downgrade back to Sierra, but even tho my MacBook came originally with ...
2
votes
1answer
86 views

How long does it take for MacPorts to catch up with new macOSes?

A Wikipedia page is pretty good at showing the precise date when a version of macOS was released. The corresponding wikipedia page for MacPorts is not quite so helpful, and the MacPorts.org download ...
2
votes
1answer
3k views

Without a backup, can I downgrade from Sierra to El Capitan?

I haven't been making backups on my laptop (I know, this is something I'm going to change!) but I really want rid of Sierra, it's mucking about my wifi connectivity loads and I'm sick of it restoring ...
1
vote
1answer
73 views

How to ensure Time-Machine can rollback to a specific-date backup? (not deleting it)

I just upgraded from El Captain to Mojave and I have a Time Machine backup of the instant before starting the upgrade. I need to be able to eventually restore the previous operative system, but I am ...
1
vote
1answer
241 views

How can I clean install of Sierra after trying Mojave upgrade?

I upgraded a Mac to Mojave and found it did not function the same as previous OS. I get a lot of people want to move forward, but I wish to go back to how my Mac was I now need to clean install ...
1
vote
1answer
1k views

Trying to downgrade to High Sierra but Time Machine restore upgrades back to Mojave

I've been having major issues with Mojave - slow-downs, connectivity issues, crashing - you name it. I tried to downgrade back to High Sierra. High Sierra gets installed fresh, but my Time Machine ...
1
vote
1answer
52 views

Beta to regular

I need some advice. I have my Macbook running MacOS High Sierra Version 10.13 Beta. I'd like to downgrade to MacOS Sierra, can someone please help me with resources, a link, or anything similar?
1
vote
1answer
3k views

Building boot caches on boot helper partition failed

Due to a Hard Drive failure I have had to restore my mac from a backup. Following the Restore From Time Machine Backup procedure under recovery mode takes about 8 hours. Eventually the data is ...
0
votes
1answer
56 views

Will I be able to revert to El Capitain if I install Sierra on my 2015 Macbook Pro?

I have a 2015 (purchased in late 2016) Macbook Pro with the following specs : 2.5Ghz Core i5 8GB of RAM Running OSX El Capitain 10.11.6 It downloaded Sierra and is asking me to upgrade to the new ...
2
votes
0answers
406 views

Can I find out the date I upgraded Sierra to High Sierra?

however silly this question might seem, there is a legitimate reason behind it... I would like to go back to Sierra on my iMac. So after creating a bootable Sierra installer I intend to wipe the drive,...
1
vote
0answers
92 views

Restore backup with TimeMachine - Downgrade Possible?

I updated from 10.10 to 10.13 (HighSierra) and I want to downgrade to 10.10. I have a backup on my TimeMachine from before the upgrade. When I restore my computer from TimeMachine, will it overwrite ...
1
vote
0answers
3k views

OS X can’t be installed on “Macintosh HD” because the version of macOS is too new

I'm currently running Sierra, trying to download the El Capitan installer from the App Store, but am unable to due to the message in the title. Is there any way around this, or am I forced to erase my ...
1
vote
0answers
1k views

Does restoring from Time Machine revert also the OS?

I want to try updating my MacBook Pro 13" (2013) from Mavericks to Sierra but I am afraid of performance issues. So I would like to be able to downgrade easily if I like. Does a Time Machine backup ...
1
vote
0answers
434 views

Restore Time Machine backup from Sierra to El Capitan [duplicate]

I'm currently running Sierra and would like to revert back to El Capitan. Is there any way I could use a backup done on a newer OS with Migration Assistant?

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