Updated the repeater fields and acf plugin this evening, message displayed asking to update the database, went ahead and did this after a backup.
ACF plugin has updated with no problems except the repeater is no longer an option and any repeaters I did have are gone on the front end?
Plugin version is now version 5.7.6.
There should also be an upgrade for the repeater field add on.
There are troubleshooting suggestions here https://www.advancedcustomfields.com/resources/upgrade-guide-version-5/#troubleshooting
If you are still having problems after trying to fix it you should roll back to V4, instructions on doing this can be found at the above link.
If you continue to have problems please contact support here https://www.advancedcustomfields.com/contact/
WordPress 5.6, ACF PRO 5.9.3 – repeater suddenly missing.