PHP, MySQL and Apache Requirements
PHP 7 or greater
MySQL 5.6 or greater
The mod_rewrite Apache module
PHP variable requirments
post_max_size 128M (48 is enough)
upload_max_filesize 128M (32 is enough)
max_input_time 600 (120 is enough)
max_input_vars 3000 (1000 is enough)
PHP memory limit 128MB (96 is enough)
If you get the Builder can’t be loaded error add this to the end of your .htaccess file
<IfModule mod_substitute.c>
SubstituteMaxLineLength 20M
</IfModule>

Reference: https://www.georgenicolaou.me/divi-requirements/