Error (11984): File conversion is not allowed for internal active serial clock source that is greater than 12.5MHz when CvP and non-volatile design security features are enabled

Due to a problem in the Intel® Quartus® Prime Pro Edition software you might see this error when trying to generate the periphery and core images for Configuration via Protocol (CvP) flow with security features enabled.

To work around this problem in the Intel® Quartus® Prime Pro Edition software version 18.1 Update 1. Download and install Patch 1.24 from the appropriate link below.

Download patch 1.24 for Windows (.exe) 

Download patch 1.24  for Linux  (.run)

Download the readme for patch 1.24 (.txt).

This problem is fixed starting with the Intel® Quartus® Prime Pro Edition software version 20.1.