Jhon_Wick Download 7-zip, open 7zFM (File Manager), then open the RAR file, if it didn’t work your file is probably broken, Right Click on the file then Select test archive, if you saw any errors related to .pak files, then there is a problem with the compressed file or there is more parts to be extracted with, there is methods to repair the file using WinRAR but i don’t think it would work.
Good Luck.