Hello.

I am looking for the original source of Portal 2 to make certain designs.
Was searching and found that it is "FF DIN" "Blod" I can not find where you download it.
Someone can have fun? or indicate the URL for download.

Yes, its DIN Bold. Its not free. Lots of places to buy it, just google.

However, it's ancestor was once used on German road signs and so is in the public domain; it can be legally downloaded for free here. It's a little different to the actual font Valve used, but pretty similar.