iThemes Security Pro 8.4.2

-Bug Fix: Make Cron scheduler available in more circumstances.
-Bug Fix: Events with the Twice Daily schedule would not be carried over when switching scheduler strategies.
-Bug Fix: Backup schedules respect the interval chosen.
-Bug Fix: Prevent multiple cron tests from being scheduled at once.
-Bug Fix: Cron test being stuck in a loop preventing a site from switching back to the cron scheduler.
-Bug Fix: Prevent warnings when a single and recurring event were scheduled at the same time.
-Tweak: Sort scheduled events in WP CLI command.

Bug Fix: Fixed issue where scheduled events could repeat on sites that do not properly support WordPress's cron system.

- New Feature: Introduces a scheduling framework for handling events. Cron is now used by default, and will switch to using an alternate scheduling system if it detects an error. To disable this detection set ITSEC_DISABLE_CRON_TEST in your wp-config.php file.
- Important: The ITSEC_FILE_CHECK_CRON and ITSEC_BACKUP_CRON constants have been deprecated. Use ITSEC_USE_CRON instead.
- Bug Fix: Fix occasional duplicate backups and file scans.