Can't import Demo data

Hey there.

So I have a major problem. I can’t import ANY demo data. I would like to import the church demo, but after abut ten seconds I get a black box with “Import failed. Try to reload the page and try again”. I did install the events calender plugin, but it doesn’t matter since none of the themes work. What I tried so far:

1. Reinstalling wordpress
2. Setting the max_execution_time to 300
3. Entering the API code
4. Deleting all the media and posts before installing
5. Install via FTP

What seems weird to me is that it starts, then imports a few images before I get the error. Sometimes more images then others. It’s very inconsitent.

Sorry if this is a known issue. I couldn’t yet find anything about it. Hope you can help.