I had a chance to test some of my free tools out: Consolation 3 seems to run fine, as does LockRattler, even if the latter still doesn’t work properly on El Capitan. I didn’t both migrating anything the second time around, but will try Migration Assistant when I have a few hours to spare. I then had to start the whole configuration process afresh. In the end I clicked on Cancel, which didn’t offer to cancel the migration, but to shut my Mac down. That dialog shows three indicators of progress: a progress bar, which became stuck at about 80% and never moved thereafter a time estimate, which became stuck at 2 minutes to go and a claimed transfer speed in MB/s, which actually incremented more like a percentage progress figure, but continued plodding past 100 without showing any signs of completion. The migration progress dialog is full of bugs, and never completed. The installation itself went fairly smoothly, but migration (of limited data from my internal Fusion Drive) was a dismal failure. I do not yet know whether this is fixed in the second version of the installer. However, if your internal boot drive is an SSD, expect it to be converted to APFS – no choice. It wasn’t, and there is now no easy way to perform that conversion, except perhaps by starting up in Recovery mode. As I was installing onto an external SSD, I had expected it to be converted to APFS from HFS+. You are given no option as to whether to convert the install disk to APFS, and on this iMac, the installer made the wrong decision, if Apple’s ‘rule’ is to be believed. Here, that took 15 minutes from the start of the installation phase, but that does not include any conversion to APFS. ![]() You’ll know that you have reached the end when a grey screen appears: that signals the start of configuration and migration. I counted at least five different progress bars, of which only one had any vaguely useful time estimate, and most had none at all. The installation is a succession of black screens, white Apple logos with progress bars which behave weirdly, and little accurate user feedback. As its log confirmed its inactivity, I quitted the installer app, opened and ran it again. My first attempt at installation died quietly after downloading the first third. If you suspect that something has gone wrong during the download or installation phase, use the Installer Log command in the Window menu to see what the installer is up to. a hidden and protected folder named Locked Files.a 5.6 GB Installer package InstallESDDmg.pkg, containing the bulk of the installation,.a small Installer package containing an incompatible app list,.The installer then creates a folder named macOS Install Data on the designated volume, into which its components are downloaded. Just a few moments later, it told the truth, as its bulk became apparent. Again, this fools you to begin with: despite my rural sub-broadband connection, it said that it would only take eight minutes. Once that is done, the main download starts. I opted for an external SSD, as my iMac’s internal storage is a Fusion Drive, which cannot yet be converted to APFS. If you want to install it on another drive, click on the button to show all mounted volumes, and select its correct destination. By default, you’ll be offered your current startup volume. ![]() ![]() Run that installer, and you’ll be walked through the usual licence agreement, and asked to select the disk on which to install High Sierra. When you first start downloading High Sierra, you might think that something is wrong: it comes initially as a small install tool, Install macOS High Sierra, which weighs in at a modest 19.9 MB, but the hefty payload has yet to come. Ensure that you make a copy of the installer app before letting it install, or you will need to download it a second time to make bootable installers, etc. Using that second version should be far simpler, and merge the initial download steps. NOTE: The process described below was that performed by the first release of the installer, which Apple has since replaced by a single monolithic installer app of 5.17 GB.
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