There is an easier way to crack xolox!
Just type

0.0.0.0 www.xolox.nl


in your hosts file and save.

It will bypass dns and use 0.0.0.0 as the IP for xolox.

(newbie instructions)
search for hosts.
open with notepad.
at the bottom type 0.0.0.0 www.xolox.nl
click on file > save.
use xolox.

You don't have to download anything if you use the aforementioned crack.

Not sure if that works.

I think if you use a hex editor (like u-edit) on xolox.exe, you can simply replace any occurances of:
www.xolox.nl

with something like

localhostxxx

Then you wouldnt have to do anything to your firewall or anything. just fire up xolox as you normally would.

This may be what was done in that crack thats floating around, but im not sure. Anyone try this?

All you need is notepad to edit the hosts file.