504 Error Gateway Timeout

I originally had Download Manager plugin. That finally gave me this error. Then I installed Download Monitor Plugin. This gave me the same error. Then I found your plugin, which I really want to work because I’m using it for sermons. If I get this to work I’ll donate. I deactivated all my plugins which didn’t help. My 2 problem are: After I add a sermon, when I go back to edit, I get a the 504 error. So I can’t edit it. My second question is: Is there a way to added a download button for my users? Thanks