So, if you are unable to install macOS Catalina even after successfully downloading it. Then you need to use the following steps in order to execute the procedure successfully: Step 1: First, reboot the Mac. Just installed a new mac Catalina and try to install Cities: Skylines. Installation works, but than it want's to have an update and that fails with a disk.
Greyfrob Said:
'how to get catalina installer from mojave: I'm unable to get an installer to upgrade mojave to catalina. The Apple knowledgeable article leads to apps.apple.com which has an invalid certificate. If I get around that by avoiding Safari in favor of Firefox, the link fails. Help! What is an alternate path'
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Unable To Install Catalina 10.15.7
Unable To Install Catalina On Mac
What to Do:
You need to use Safari for this. Firefox will not work. So, what to do...
- Open: Safari
- Go here:How to get old versions of macOS - Apple Support
- Scroll to: Download macOS using Safari on your Mac
- Select: macOS Catalina 10.15
Aug 1, 2021 1:41 PM