W.P. Ginfo on "I keep getting the Error 500 after I installed my theme last night"

Try to sort out the FTP-acces; It's an important tool to access your site.

Check out http://www.wpbeginner.com/wp-tutorials/how-to-fix-the-internal-server-error-in-wordpress/ to solve this problem.

Alternatively try this:

1. Use FTP to access your site
   bv. http://filezilla-project.org/download.php
   Or: use the webaccess provided by the webhost and use the filemanagement the webconsole of the webhost.
2. delete the theme-folder of the offending theme
3. Check the result; Make sure you refresh the browser!
   <CTRL-F5> or empty the bowser-cache: http://www.wikihow.com/Clear-Your-Browser%27s-Cache

== == ==

Does the above NOT work?
Try this:

1. rename all plugins by putting a '0' in front of each plugin -folder;
   ../wp-content/plugins
2. Check if the access / 'normal functioning' has been restored
3. If so: one-by-one, remove the '0', checking every time to see if the problem re-occurs.
4. when the problem re-occurs, you've found the source of the problem; Delete and find a similar plugin that works with your site
5. alternatively: FTP:Delete; Then download and install / activate a NEW version of the problematic plugin and see if this works.