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Can I install Mojave on a Catalina computer

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Robert Withers
Can I install Mojave on a Catalina computer
on Mar 12, 2020 at 2:29:19 am

Hi,
B&H can't tell me what OS their computers for sale run.
I've heard that if you have Catalina on a computer you can't re-install Mojave.
I have a Mojave install stick.
True or false?
Thanks,
Robert

Robert Withers

Independent/personal/avant-garde cinema, New York City


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John Rofrano
Re: Can I install Mojave on a Catalina computer
on Mar 13, 2020 at 3:14:14 am

[Robert Withers] "I've heard that if you have Catalina on a computer you can't re-install Mojave."
I believe what you cannot do is to "non-destructively" go backward from Catalina to Mojave, but if you boot your Mac with the Mojave USB stick and you format the internal hard drive, it has no idea what operating system was on there. At that point I don't see why you couldn't install Mojave on it.

Here are instructions I found that tell you exactly how:
How to downgrade from MacOS Catalina to Mojave

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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Kirk Pitts
Re: Can I install Mojave on a Catalina computer
on Mar 18, 2020 at 11:22:37 am

Generally in my experience and, I've been installing macs for a school since 1997, you can install the earliest OS that in in use at the time of machine manufacture. Except in the case of new models being made for the upcoming OS. The most recent example was my 2017 5K iMac. The new disk format has made it more difficult.

Kirk Pitts.
video amateur.
Personal skateboard and band historian. ;)


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