Download nvidiaProfileInspector
Click Sun icon in the top bar of inspector to create profile
Name it FF7 Rebirth
Click on the icon to the right to add application
add both FF7 Rebirth exes ( steamapps\common\FINAL FANTASY VII REBIRTH\End\Binaries\Win64 should be location of second exe)
Download XML file and DLL files from this reddit post (
https://www.reddit.com/r/nvidia/comments/1i82rp6/dlss_4_dlls_from_cyberpunk_patch_221/?sort=new )
place XML file in same folder as nvidiaProfileInspector.exe
Restart nvidiaProfileInspector
select profile J for DLSS
apply changes
Replace FF7 Rebirth DLSS file with the one downloaded earlier (path to default file steamapps\common\FINAL FANTASY VII REBIRTH\Engine\Plugins\DLSSSubset\Binaries\ThirdParty\Win64 )
Should be good to go