I think you need basic understanding of file size ^_^ Let's see if I can help.
The file size on a computer are in bytes.
1 KB = 1 kilobyte = ~ 1000 bytes (1024 actually but lets not get into that)
1 MB = 1 megabyte = ~ 1000 KB
1 GB = 1 gigabyte = ~ 1000 MB
So, with this you can figure out that your sakray full which is 1002.73 MB is about 1 GB. And since your hard disk has 67 GB free you have PLENTHY of space for it ^_^ (you could fit RO 67 times lol)
480MB of ram (which I'm assuming is actually 512MB of ram) should be enough to run RO.
The file you point to is 3 MB, which is 333 times smaller than the sakray file, so I very much doubt its enough to play (in fact I'm sure its not). This is probably just the patcher for your server.
Sakray is one of the original 3 kRO servers if Im not mistaken, it was their "test server" sorta where they checked out their newest stuff.
So, you WILL have to download + install Ragnarok + Sakray, and THEN you apply your server patch (the 3 MB file you just posted a link to).
Lastly, I'm sure if you post on FortunaRO forums they might help you.
