So, I tried to download 2.8 yesterday and it didn't work because my graphic cards are old, so I tried to download 2.79 today and it says that there's a newer version installed and it doesn't download despite the fact I already uninstalled every Blender file in my computer before downloading.
Just get the 2.79 portable version on www.blender.org
Since it's just a .zip file, you don't have to install it, and the first time you open it, it will automatically set itself up in the OS
However I doubt your graphics card are a problem (Blender doesn't require a graphic card to run). You could try updating your drivers, or at least try the 2.80 portable version before downloading Blender 2.79