How to implement RFU/OTA to STM32L496?

[AMCL]

Hello,

So I want to add RFU or OTA to my code as a feature. I saw an rfu source code to one of the expansion of STM32, however it is disabled. I tried to enable it by defining RFU but somehow there are missing files such as se_def.h and se_interface.h hence the failure to compile the program. I looked at the folder of the expansion and both of the files are not included. Where could I find these files and I would like to ask for help how to properly implement RFU or OTA to my program.