Ok, HEAT rounds don't work this way. This is functionally a miniaturized plasma blade made from a soft metal and launched at the target at hundreds of feet per second. From the description this should only work if the round strikes perpendicular to the armor, the soft metal melts more slowly than the hardened alien materials designed to reflect plasma away from the armor, and the soft metal can maintain some sort of seal or hard shape after impacting the armor and having hot rapidly expanding plasma released between it and the armor.
How do you imagine packing plasma into a bullet and keeping it inside until the weapon is shot? The bullet will melt once it is made. Even if you have materials that wont melt, the heat will diffuse through the metal and cause the gunpowder explode pre-maturely. Even if that wont happen, plasma will lose heat by the time it is delivered to the battlefield.
Actually as noted here we are offering a 2.5 nightly build
But only Windows ones, no Linux or Mac builds... Really, there isn't much Linux releases as well.