I'm trying to download files and they are greyed out; I can't access the files. I am using Safari. Help!

Some versions of Safari  by default block any downloads from websites of "unknown developers," or websites you have not explicitly authorized as sources for downloaded files. As a result, your security settings may be blocking your ability to download files from our course application.

To solve this issue:

1. Open Safari on your Mac
2. Click Safari in the menu bar (top left corner) then choose Preferences…
3. At the top of the window, click Websites
4. Now on the left-hand sidebar click Downloads
5. Click the Ask/Deny/Allow drop-down on the right-hand side next to all SupertutorTV hosted sites and select "Allow" in the drop-downs. 
   
   
6. If SupertutorTV sites do not appear in your list, change When visiting other websites from
   "Ask" to "Allow." 

You can also read more about the issue here:

https://support.apple.com/guide/safari/if-you-cant-download-an-item-from-the-web-ibrwa006/mac