1. Open Cinema Tools application
NOTE: It is a good idea to backup the files before you confirm them.
2. Batch Conform the folder where the movie file resides. A pop-up window will appear, choose 24 fps and that is it. Seriously that is it, all the movie files under this folder are already conformed to 24 fps.
File -> Batch Conform
3. Go to the folder that you chose in the previous step, you will see a conform.log file and a "conformed 24.0" folder, under this folder it will have all the movies conformed to 24 fps.
4. In order to confirm it, just right click on the movie and open with "Cinema Tools"
Under the "Analysis" tab see the details of the movie and if you see Frame Rate as 24.00FPS. Voila.