MY FRIEND TESTED THE GAME WITH THE LATEST VERSION, AND CONFIRMED THE GAME BEING PLAYABLE ALL THE WAY TO THE END.
HE TOLD ME ABOUT TWO MAJOR GLITCHES.

FIRST GLITCH: IN THE CEMETERY MANSION, THERES 2 DOORS THAT CAN FREEZE THE GAME, YOU WILL NEED MULTIPLE ATTEMPT TO GET THROUGH THOSE DOORS , SO SAVE BEFORE DOING SO AND MORE OFTEN IN THAT SPECIFIC AREA.

SECOND GLITCH : IN THE ICE CASTLE, YOU HAVE TO JUMP IN A HOLE AND  IT CRASHES THE GAME, SO HE USED THE SWORD ATTACK AS HE JUMPED IN THE HOLE TO GET ALL THE WAY DOWN. SO DO THAT SO SAVE MORE OFTEN IN THAT SPECIFIC AREA.

Brand new game.
Works perfectly !
Expansion pak is required.

I CAN ALSO SELL A N64 PROGRAMMER SO YOU CAN UPGRADE YOUR CART AT EASE IF NEW PATCHES ARE RELEASE..