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PHP settings for theme installation

PHP version should be 5.6 atleast.

Ask your hosting provider to check the following settings in "php.ini" file.

1- post_max_size = 120M
2- upload_max_filesize = 120M
3- memory_limit = 500M
4- max_execution_time = 300
5- max_input_time = 300

Memory limit can also be increased through WordPress configuration

https://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP