Sometimes the Sierra installer app fails, leaving you frustratingly still in El Capitan. Here’s what to do next.
DiskMaker
How to repartition and install El Capitan afresh on an old iMac.
Sometimes the Sierra installer app fails, leaving you frustratingly still in El Capitan. Here’s what to do next.
How to repartition and install El Capitan afresh on an old iMac.
The Eclectic Light Company 