If you want a weapon that looks like the Alien Blaster, but fires projectiles that causes fire damage, then get this weapon from the TES Game.RU website.
This is the Firelance 2.0 . This may look like the Alien Blaster, but don't mistaken this weapon for being such. The link to this weapon is listed below from the TES Game.RU Russian website.
UragGro deserves a thanks for localizing the mod on the TES Game.RU website. But Neeher is the author of this mod and his mod is on the Nexus at the link below.