Unable to do roblox weapon animation in blender

so this is what I was trying to do, make a weapon animation for a first person shooter game but there is a problem
2. What is the issue? Include screenshots / videos if possible!

the important thing which is robloxblender2 won’t download on my computer for some reason.

  1. What solutions have you tried so far? Did you look for solutions on the Developer Hub?
    I have tried to animate it with something else, won’t work, I did look on here to see if someone else had this problem but I couldn’t find it.

thank you in a advance.