Server issues compatibility

I got cut off talking with Luis who was helping me with a server issue that was occurring when trying to install CoursePress and stopping myself from backing up. I started using WPMUDEV only a few hours ago then all these problems started. But, Luis reassured me that it wasn't WPMUDEV related, rather the server. However, I've spoken to my serve three times and they said they've fixed anything on their end. So, if someone could please help me troubleshoot these issues (I'm still learning and its early days) that would be tremendously appreciated.

Thank you kindly.