Fast Fix: WordPress Website Error [Menționează eroarea, ex: Critical Error / Database Error]

My site has suddenly dropped into a “Critical Error” state right after I installed a specific new plugin. I know exactly which plugin triggered the problem, but I need a seasoned WordPress troubleshooter to step in fast... (Budget: $15 - $25 USD, Jobs: HTML, MySQL, PHP, Web Security, Website Development, Website Management, Website Optimization, WordPress, WordPress Design, WordPress Plugin)