Just removed the alternator and found out that its impossible to take it out without removing the lower alternator bracket and pulling it out through the bottom. The problem is that the lower bracket bolt is seized and i cant seem to make it budge, I put a ton of wd40 and it still wont come off, any advice.

 

Is the block still in the car? Assuming yes. If not, try an impact wrench. Have you tried actual penetrant like liquid wrench? WD-40 White Lithium? Assuming the worse of course, still in car, can't impact and maybe have a breaker bar. My best suggestion is patience and perseverance, keep spraying and tugging away at either breaker bar or wrench. And definitely try an actual penetrating fluid. Heat also works, if you can get a torch on it from either above or below. Just don't torch it if you're spraying chemicals on it of course.