If you see a blocked macros error, here's some advice from Louis:
The way I fixed this was to simply unblock macros by modifying the file properties.
- On Windows this can be fixed by right clicking the file (make sure you don't have the file open)
- Click "Properties"
- At the bottom of the "General" tab, you should see a checkbox titled "Unblock"
- Check the "Unblock" checkbox. Then click "Apply" and "Ok".
That's it. For me, that was all I needed to do to allow the file to run macros.