Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
This module currently checks if Rank Math is installed as a standalone plugin and not as bundled in your theme. You will need to install ACF via the plugins page to fix this.
Looking forward to helping you. Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.