@retrofreak89 Since you have the paste, I recommend that you try it. Make sure everything is clean, even of finger oil. You can probably find a video online of someone doing this the right way. Use just enough paste for coverage and so it sticks. No more. If you use too much (if you can squeeze it out the sides, it is too much). If too little, you only get coverage in a small area and you are not conducting the heat. Just right is full coverage, no squeeze out (or the squeeze finishes the coverage).
Then, see if the vacuum effect is enough to hold it on and monitor it. You might be just fine. If it starts to slide, well, now you know and you can pull it off, clean it and use a harder thermal CPU compound. Mine has been working and not moving for over a year. Heat, cool and re-heat (power cycles) can make it firmer over time.