Databade errors upon activation

After installing Modern Events Calendar Lite, clicking the “activate” button yields the following errors:
WordPress database error: [Multiple primary key defined]
ALTER TABLE wp_mec_events ADD PRIMARY KEY (id), ADD UNIQUE KEY ID (id), ADD UNIQUE KEY post_id (post_id);

WordPress database error: [Duplicate column name ‘days’]
ALTER TABLE wp_mec_events ADD days TEXT NULL DEFAULT NULL, ADD time_start INT(10) NOT NULL DEFAULT ‘0’, ADD time_end INT(10) NOT NULL DEFAULT ‘0’;

WordPress database error: [Duplicate column name ‘not_in_days’]
ALTER TABLE wp_mec_events ADD not_in_days TEXT NOT NULL DEFAULT ” AFTER days;

WordPress database error: [Multiple primary key defined]
ALTER TABLE wp_mec_dates ADD PRIMARY KEY (id), ADD KEY post_id (post_id), ADD KEY tstart (tstart), ADD KEY tend (tend);

WordPress database error: [Multiple primary key defined]
ALTER TABLE wp_mec_occurrences ADD PRIMARY KEY (id), ADD KEY post_id (post_id), ADD KEY occurrence (occurrence);

WordPress database error: [Invalid default value for ‘updated_at’]
CREATE TABLE IF NOT EXISTS wp_mec_users ( id int(10) NOT NULL, first_name varchar(255) NOT NULL, last_name varchar(255) NOT NULL, email varchar(127) NOT NULL, reg TEXT NULL DEFAULT NULL, created_at datetime DEFAULT NULL, updated_at datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ) DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

WordPress database error: [Table ‘intranet_wp03.wp_mec_users’ doesn’t exist]
ALTER TABLE wp_mec_users ADD PRIMARY KEY (id);

WordPress database error: [Table ‘intranet_wp03.wp_mec_users’ doesn’t exist]
ALTER TABLE wp_mec_users MODIFY id int NOT NULL AUTO_INCREMENT;

WordPress database error: [Table ‘intranet_wp03.wp_mec_users’ doesn’t exist]
ALTER TABLE wp_mec_users AUTO_INCREMENT=1000000;

WordPress database error: [Table ‘intranet_wp03.wp_mec_users’ doesn’t exist]
ALTER TABLE wp_mec_users ADD UNIQUE KEY email (email);