Last week a relative gave me his old iMac 27” 2011 [HDD]. I Planned to run it off a bootable external SSD with Mojave 10.14.6 installed — I wasn’t aware of the hardware limitations i.e. the iMac’s hardware only supports MacOS up to High Sierra.

How could I run Mojave on this iMac?

Responders may suggest 1) patch with dosdude's patcher (not compatible with this model iMac) or 2) use High Sierra. My problem with the 2nd suggestion is that I'm already set on Mojave with software licenses (with machine install limits/hardware locks etc.) and all sorts of custom software patching setup for audio production that will be a nightmare to replicate (obviously I can't use a Mojave Time Machine BU to go backwards).

Any ideas welcome.

  • In what sense are Mojave and High Sierra incompatible for you? – lhf Aug 10 '19 at 18:38
  • It's not really clear what your question is here. Are you looking for ways to get Mojave to run on an iMac 2011? Are you wondering what use a iMac running High Sierra could be to you? Are you looking for differences between High Sierra and Mojave which would make use of both in parallel difficult/impossible? Please be specific in your question (and keep in mind that some of them are probably too much a matter of individual taste and opinion to really be answerable). – nohillside Aug 10 '19 at 18:47
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    Having said that: running two Macs with different macOS versions isn't a problem as such, as long as the applications are the same (or at least use the same data format). – nohillside Aug 10 '19 at 19:10
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    Actually, osxdaily.com/2018/09/27/… is the first link coming up when I search "running mojave on old hardware" – nohillside Aug 10 '19 at 19:13
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    @Vaultnaemsae My strong recommendation would be to use this iMac with a compatible macOS version. Besides the obvious hassle of trying to get it to work with an unsupported OS, this model iMac is renowned for having problems develop over time with its GPU (these can be rectified, but it's a bit involved and not for most users). My point being that if it works at present, then put it to use for a different purpose (i.e. if your software doesn't run on it). Otherwise use it with the software you need on High Sierra. Most software that runs on macOS Mojave will run on macOS High Sierra just fine. – Monomeeth Aug 11 '19 at 1:47

You could try http://dosdude1.com/mojave/, although I don't know if that would work in your configuration.

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