Hello Hotas,
You can find the sample code for FRDM-KL25 in the KL25_SC.exe file.
The following path is related to the Freedom Demo source code.
kl25_sc_rev6\klxx-sc-baremetal\src\projects\FRDM_KL25ZDemo
The following path is related to the Freedom Demo project (IAR).
kl25_sc_rev6\klxx-sc-baremetal\build\iar\FRDM_KL25ZDemo
Regards,
Mario