Unable to install

I try to install and it gives the following error:

Unknown collation: ‘utf8mb4_unicode_520_ci’

CREATE TABLE wp_trustindex_collector_schedule_list ( id BIGINT(20) NOT NULL AUTO_INCREMENT, email VARCHAR(255) NOT NULL, name VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci NOT NULL, order_id BIGINT(20) NOT NULL, timestamp INT(11) NOT NULL, sent TINYINT(1) NOT NULL DEFAULT 0, created_at DATETIME, hash VARCHAR(50) NOT NULL, opened_at DATETIME NULL, clicked_at DATETIME NULL, feedback TEXT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci NULL, feedback_at DATETIME NULL, PRIMARY KEY (id) )

I have run the suggested SQL in PHPMyAdmin, and I get the following error:

#1273 - Unknown collation: 'utf8mb4_unicode_520_ci'