Here is a link to our full tutorial on how to fix 500 errors.
It appears after looking at the Apache errors your site is generating, they all are having to do with a missing <IfModule> section in your .htaccess rules.
This is happening on line number 39, it appears that you have your rewrites repeated multiple times as well. You can read more about how to modify your .htaccess file here:
How to edit your .htaccess file
It almost looks like you could simply delete everything above line 45 and just keep the rest. At the very least you'd need to remove this section from line 38 - 42 to get rid of the errors:
Please let us know if you have any other questions at all.
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