Kontakt Player 5 is completely free, but Kontakt 5 is not. It also, IMO, does not come with super realistic guitars (they're OK, but not specialized).
Okay, the WAV one works now. So like mentioned earlier, the most tell-tale issue is the lack of sympathetic resonance; it sounds like partial unison bends every time you play more than one note at once.
Other things:
- The EQ in the low mids is boosted quite a bit, and it's also boosting the result of the reverb. Seems like the reverb may be in the amp sim, with the EQ placed after the amp sim in your DAW. I usually don't put an EQ after the reverb, but reverb after the EQ. After the reverb makes the instrument sit better in the mix, it may add more low end ambience depending on the Low Cut setting if you have one, and putting an EQ next in the signal chain boosts that ambience too.
- 1:28 - 1:41 gets really loud.
- Consider panning on the lead guitar to add more spaciousness and subtlety, and double-tracking the rhythm guitars (hard-pan left and right different takes). The whole thing sounds so narrow in the stereo field.