The below error may appear on the installation processing. We separate the solution to solve the issue by the operating system.
Error: System required PHP Version >= 7.1.3
Solution: Set PHP Version for Domain
1. Login to your cPanel
2. Select "MultiPHP Manager" under a Software category.
3. Select domain and assign php version :
Recommended "PHP 7.2 (alt-php72)" or "PHP 7.2 (ea-php72)
Error: Fatal error or RVsitebuilder CMS crashing.
Solution: Force update RVsitebuilder
Go to RVsitebuilder 7 Plugin and click Action Repair.