How To Update Macos High Sierra 10.13.6 To 10.15 File
One more tip: If your Mac has a mechanical hard drive (not SSD), Catalina will feel much slower than High Sierra. In that case, consider upgrading to an SSD or staying on Mojave.
One more tip: If your Mac has a mechanical hard drive (not SSD), Catalina will feel much slower than High Sierra. In that case, consider upgrading to an SSD or staying on Mojave.