Sir please can you post here about INSTALLING PROCESS ?
1-Copy downloaded rom to external SD card of your phone
2-Activate development mode in your phone then turn on OEM Unlock & USB Debugging
3-Install Samsung USB driver to your PC
4-Start your phone in download mode (Power off your phone and press 3 keys in same time (Power+home+volume down) to start up
5-connect your phone to pc and run Odin app then press Volume Up of your phone
6-Flash TWRP app to your Phone
7-disconnect the phone from PC and start it in recovery mode (Power+home+volume up)
8-Twrp will start then format system & data and select install, locate downloaded rom on SD card to flash it and after finished select wipe Cache and reboot.