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My issue was solved by Dirk in...
Updated to 10.12 and was able to install. Thank you.
Unfortunately, I am trying to load an El Capitan OS, 10.11 and though I am able to install it from a USB, it won't run under parallels. It gets...
yes, please do post. I have a disk image from SuperDuper that I am trying to load on my laptop.
Guest OS is 10.11, El Capitan. Other guest OSes are fine.
Likewise Host is Mac OS 15.3, with latest version of Parallels. Install from a DMG, either basic on a Thumbdrive, or a DMG created by a SuperDuper...