"This App cannot run on your computer" whenever trying to install forge

[Nakaru 0]

Whenever I try to run and install forge on my computer, it keeps giving me the error message of "this app cannot run on your computer." I do not know what to do about this. I just bought Minecraft today, and my friends really want me to play mo creatures with them. I am getting very frustrated and upset, it does this for every version of forge I try to install. I enjoy vanilla minecraft, but mods look so fun. If anyone knows what I can do to help this, please. 
I think my computer is windows 8, but I am not entirely sure.

[DaemonUmbra 338]

Where are you downloading Forge from?

[Nakaru 0]

https://files.minecraftforge.net/

 

From here

[DaemonUmbra 338]

Can you provide a screenshot of the message? Also why Windows 8?

[Nakaru 0]

What do you mean why windows 8?

[diesieben07 6585]

Are you using Firefox? Did it by chance flag the file as "unsafe" and replace it with a completely empty file? If so, tell it to keep the file.

[Nakaru 0]

Yes, I am using Firefox. I tell it to keep file, but I don't know if it is actually. This is what the download looks like. Is this supposed to be it?