Thank you for your question. If it was a plugin they installed, our guide on troubleshooting Wordpress plugins may help you get your site back up.
If it was not a plugin they installed, what was installed? Was it a theme?
Are you getting errors? What is the full error?
Can you provide a link to the site, so we can see, and replicate the problem?
If you have any further questions, feel free to post them below.
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