Get the latest version from http://sourceforge.net/projects/wpn-gaim-prpl/
as it's not in our archive.
If you ask for compiling instructions I guess you're running Linux?
Compiling that plugin works like compiling everything else on linux - extract the folder somewhere, cd into it and use 3 simple commands
3. make install (as root or with sudo)
Of course you need to have some "build essentials" installed for it to work - that's a package name on debian btw. and I think on Ubuntu as well.
On other distros look for gcc, c++, make, etc......
When you run ./configure it will tell you what's missing in most cases.
PS: In case you're running Windoze I believe all you have to do is place the .dll in the folder into your pidgin folder