"Should I Update My Old Mac from High Sierra to Mojave?"
If you rely on old hardware or on old software you can't update, I suggest you leave Mojave alone. You're likely to run into a number of more or less serious incompatibilities without gaining much to compensate. In my own case, I had enough problems that I wound up downgrading from Mojave to High Sierra -- the first time I've ever had to revert to an earlier version of the operating system. Here are a few specific reasons you might want to stick to High Sierra. 1. Sketchy support for older Macs. With my 2010 Mac Pro 5,1, I had to temporarily disconnect all internal drives except the boot drive before I could install or reinstall Mojave. Otherwise, the installer would stop partway through with an error message. Also, Mojave required a firmware update that caused some sort of error with the saving of startup disk info. TinkerTool System identifies it as a problem with NVRAM, and though the Mac starts up on the correct disk, shutdown times can be unusually slow when swit