I first tried redownloading the zip and reuploading everything, increased js/xenforo/cache_rebuild.js to 3000000, data and internal data folder are chmod to 777.
I still can't get it installed. I'm just stuck at 2b and then I show server error 500. I have 1and1 so I don't have access to server error logs but they provide a php script for this that you insert. The code is here: http://faq.1and1.com/scripting_languages_supported/php/14.html
Where and how would I put it what file?
The shared hosting has a maximum of 40mb php memory max and you can't increase it. I've installed ipb 3 and vbulletin 3.8 without a problem. If the php memory is the problem, can anyone recommend a another host? If anyone wants to try themselves, my site is listed in the profile, forum is in webroot, no forum subfolder.