I have a MacBook Pro that used High Sierra operating system. The data was backed up using Time Machine to a WD My Book for Mac external hard drive. To make a long story short, the laptop had a malfunction for which the Apple technician recommended that I revert back to the previous operating system, Sierra. In doing so, all the data, apps, etc. were wiped clean from the computer. I have tried to connect the external hard drive directly to the laptop to restore the data, but the laptop does not recognize it. How can I get the data from the external hard drive to the clean laptop? I also have an iMac desktop computer. Is it possible to work through the iMac to get the data from the external hard drive to the laptop?