When running the Vectorworks Updater, the Update may fail. This may be caused by incorrect permission settings, especially on Mac OS X/macOS. To fix this, try changing the permissions on the Vectorworks 2019 folder, in the Applications folder.
Right-click on the Vectorworks 2019 folder and choose "Get Info". At the bottom of the window, you will see "Sharing & Permissions".
You should see your current user name listed here, followed by (Me). If you do not see this, click on the + button on the bottom left of the window and add your user name to the list. Once it is added, change the permission to "Read & Write".
Next, you will want to make sure those permissions are correctly applied to the items inside of this folder. To do this, click on the Gear icon at the bottom and choose "Apply to enclosed items".
Once the permissions are applied, run the Vectorworks Updater again and it should complete successfully.