There are a couple of reasons for this message to appear. One is that the machine doesn't satisfy the release requirements (memory size or processor type). Another is that the installer you are using is too old a copy, and the security certificate has expired (yes, the message is misleading). There may be more reasons, but these are the ones I see most often.
Install Sierra, then try upgrading to HS. If you get the same message, you haven't lost anything but time. It very well may give you more information about what the problem is, given that it has a more standard user environment at installation time to play with. > On Nov 13, 2017, at 2:15 PM, Carl Hoefs <[email protected]> > wrote: > > Okay, I just verified what y'all are saying. > > If I just copy the installer app to the flash drive and then option-boot, it > does show up as a valid option, "Install Mac OS X", but when selected this > fails with a generic error message, and reboots. > > Only if I use the createinstallmedia command as per Apple's tech doc does it > get far enough to bring up macOS Utilities, allowing me to install macOS. > > But... I couldn't get the High Sierra installer to work, regardless. I had to > install Sierra instead. This is on an iMac12,2. Not sure what the issue is > (firmware?), but HS won't install on it. I tried about 5 times. It gets > almost to the end, and then pops up a generic error saying that macOS can't > be installed on this machine, check your hardware, blah, blah. > > Now I'm worried that if I upgrade from Sierra to HS I'll get stuck in the > same Catch-22. > > -Carl > > > On Nov 13, 2017, at 5:19 AM, Neil Laubenthal wrote: > >> Actually… >> >> It depends on what you want your USB installer to do. If you want a bootable >> USB installer then you need to use one of the applications that will make a >> bootable one or use the technique available on the web to use the >> makeinstallmedia command from terminal. If you just want to put the >> installer itself on the USB drive, stick it into another Mac booted from >> it’s internal drive and use the installer on the USB to do an in-place >> upgrade…that will also work; doesn’t need to be a bootable USB for that. >> >> I’ve done it both ways over the years…albeit not with High Sierra. >> >> >>> On Nov 11, 2017, at 11:06 PM, Carl Hoefs <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> >>>> kay, I guess I was given bum advice. Somebody swore that he did it by just >>>> copying the install macOS .app to an otherwise empty USB flash drive. That >>>> approach seemed a little too easy, so I thought I’d ask. >>> >> >> >> ----------------------------------------------- >> There are only three kinds of stress; your basic nuclear stress, cooking >> stress, and A$$hole stress. The key to their relationship is Jello. >> >> neil >> >> >> > > _______________________________________________ > MacOSX-talk mailing list > [email protected] > http://www.omnigroup.com/mailman/listinfo/macosx-talk
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