Thank for the information. Here is a link to our guide that covers common causes for 500 errors
Here is a link to a guide on installing Magento locally
, from Magento's official support forum.
Also, if it is trying to resolve to an online web address, you may have to perform a host file modification
, so it it will resolve to your computer instead of looking online.
Unfortunately, since you are not running on our servers, we are unable to access your files/settings and provide specific information.
If you have any further questions, feel free to post them below.