Troubleshooting macOS High Sierra Install Problems (opens new window) # 1.Check If the Install is Still Going on Calculating time remaining.' Here shows you how to confirm if the installation is still going on and how to complete the update successfully. If your macOS update also get stuck at 'Installation is in progress.
The progress bar has been stuck at 40% or something, showing: 'Installation is in progress. After downloading the macOS installer, you try to install the macOS Catalina/Mojave, macOS Sierra or High Sierra but the installation get stuck. MacOS installation problem happens all the time.
