Ballserver was included with kitserver from version 6.0.2 (latest is 6.0.4).
You should have a balls folder under GDB in the kitserver folder (balls will be in the same folder as uni).
The link above is one of many ball folders available on the forums. All you do is replace the balls folder that comes with kitserver with one you have downloaded or were using with pes5.
dmxdex, the balls aren't generally hires(512x512).
I'm using a huge HD ballpack from pes5, can't remember where I got it though, was ages ago. Might still be some pes5 threads around with big packs if you want the HD balls.