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macOS Catalina

We advise waiting a while before updating your Mac to Catalina, for two reasons: firstly it has bugs, which Apple is steadily fixing; secondly it introduces a security system which is causing problems for software which hasn't been adapted to deal with it. VirtualBox is an example at the time of writing. Here are some particular points to note.

32 bit apps

Catalina has no support for 32 bit apps. This Apple Support article explains what to do, including how to find any 32 bit apps on your Mac:


Catalina has a new security regime. The first time you run software on Catalina you will be prompted to grant it permission to do various things such as notify you or access the disk.


The stable version of VirtualBox current at the time of writing, 6.0.14, crashes when run on Catalina unless you give it permission to access the disk as follows:

  1. Close VirtualBox and ensure that it's not running.
  2. Open System Preferences
  3. Click Security & Privacy
  4. Click Privacy
  5. In the left-hand pane, select Full Disk Access
  6. Using the + button, find the file (in the Applications folder) and double-click on it


An OpenAFS-compatible client for Catalina can be downloaded from Auristor. We've tried it; it seems to work.

macOS Mojave

We'e tried AFS on macOS on Mojave and it seems to work properly.

macOS High Sierra and older

We don't recommend using versions of macOS this old - please upgrade!

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