Though it would be nice, it is actually not possible to download RAM. RAM is a form of memory your computer uses, and is purely hardware. This means it is a physically thing. Something you can touch and feel directly.
This memory or RAM lives inside the case of your computer and cannot be downloaded from the Internet. You cannot increase the size of your RAM by installing a program or downloading a file or changing some software settings on your computer.
The only way to add more RAM to your computer is to physically go and buy some, open your computer up and install the RAM.
Telling someone to download more RAM is a joke on the Internet, nothing more. It would be like telling someone to download some gasoline for their car. Gasoline cannot be downloaded through a computer.
