Reinstall OS X by booting from the Recovery HD using the Command and R keys. Download and install the OS X El Capitan 10.11.6 Combo Update or 10.12.6 Combo Update or macOS High Sierra 10.13.2 Combo Update as needed.For both Mac and Windows PC, we recommend that the computer you use to run the Kindle Previewer meets or exceeds the following requirements: Kindle Previewer 3 can be used on machines running Mac OS X v10.11 or later and Microsoft Windows 8.1 (64-bit) or later.Once the installation is finished, restart the virtual machine Click the Actions menu in the macOS menu bar and select Reinstall Parallels Tools. Fixed in 16.1.0 : 8: Virtual machine apps showing a black window upgrading an existing macOS virtual machine to Big Sur. A macOS virtual machine showing a black screen after upgrading it to macOS Big Sur.According to the issues of macOS Sierra installation stuck above, here are some of the corresponding solutions to those problems as following: Get rid of unnecessary files in your system to get more disk space for the macOS Sierra installation.The report claims that Apple has diversified its supply chain. Apple's 12.9-inch iPad Pro with Mini-LED display will launch in the first quarter of 2021, according to a new report from DigiTimes.