I moved a client's site locally to upgrade the CMS and make some edits before moving it back to production. I installed the latest version of 2.0 and everything worked great until I tried to login. I can get to the login screen and once I login this is the error I get:

www.localhost is currently unable to handle this request.
HTTP ERROR 500

It happens with PHP 7.0 and 5.6.10 is there another step I am missing?

[KK]

Please take a look at the web-server's error log. It should give you the exact reason triggering this error.
Let me know what you find.

Attached is the error log.

[KK]

Following is the error reported in the log -

PHP Fatal error: require_once(): Failed opening required '/cms/includes/ckeditor/ckeditor.php'

Please check and see why the file highlighted above cannot be opened - most probably it is missing owing to incomplete upgradation. If so, please restore the 'ckeditor' folder from the installation zip.

Hope it helps.

That did the trick. Thanks KK.