If you got error 500 when you click Edit on cPanel control panel, it's mostly that some required environment is dropped or disabled.
Check in error log
File Manager -> rvsitebuildercms -> domain name in question -> storage -> logs -> view the today log file "laravel-20xx-mm-dd.log
sample of error in log file
Solution followed by error log
Go to PHP Selector and enable the "fileinfo" (more of setting here)
Access and click Edit website on Rvsitebuilder 7 again.