There is nothing wrong with using Mediafire to download a texture pack. Bear in mind that Mediafire doesn't necessarily check files uploaded to their system for viruses, so you'll want to do that yourself when you download from them, though that's true of any downloads.
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You can get 'old ROBLOX' by downloading the 'Roblox Old Texture Pack Hq'
Minecraft texture packs should not have any viruses in them. I have never heard of anyone getting a virus from a texture pack, so you should be all set.
Download the texture pack and put it into the Minecraft Texture Pack folder.
The Texture Pack they use is the Tekit version of Sphax 1.5 texture pack.
Download the Texture pack it should be in a .zip file (you will need 7zip or WinRAR) then you need to put the .zip file in your Minecraft Texture Pack folder which is located in you AppData if you are using Windows Machines.