Hey Joan,
Thanks for reaching out!
The requirements for our plugins are the same as the requirements for WordPress itself. So, PHP version 5.6 or greater and MySQL version 5.6 or greater (OR MariaDB version 10.0 or greater).
f you are in a legacy environment where you only have older PHP or MySQL versions, WordPress and our plugins will also work with PHP 5.2.4+ and MySQL 5.0+. But these versions have reached official End Of Life and as such may expose your site to security vulnerabilities.
I hope this information helps!
George