Unable to install or update to Mojave on Optiplex 990 running High Sierra

successfully installed High Sierra on OptiPlex 990 in Legacy mode. I have trouble figuring out UEFI mode, and adding a BOOT source properly, so Legacy mode seems to working just fine.

Compiled Hackintosh version of Mojave as directed by guide for new drive, and also tried installing from Native Mac OS installer over the High Sierra install, but error message received. "Unable to install - corrupt installer. I've tried downloading the Mac Os Mojave installer on several different...

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Author: rcohen04