Gimp will work on a 32 bit system I have it installed on my 32 bit system and I have the DDs plug in.
Any questions about GIMP should be directed to them they are very good about answering questions.
THE PLUG IN ONLY WORKS OR IS ONLY DESIGNED TO WORK WITH VERSION GIMP 2.8 AND NEWER.
The DDs is here:
http://registry.gimp.org/node/70
http://code.google.com/p/gimp-dds/downloads/list
GIMP2.8
DOES NOT need a 64 bit system. It runs on 32 bit as well.
Version 2.8.10 will run on any of these systems :
Windows XP SP3 and XP x64 SP2
Windows Vista
Windows 7
Windows 8 and Windows 8.1
Windows Server 2003 SP2 and 2003 R2
Windows Server 2008 and 2008 R2
Windows Server 2012 and 2012 R2
http://www.gimp.org/downloads/
WHEN YOU DOWNLOAD THE PLUG IN:
To install, extract files to your GIMP plugins directory.
This directory is usually located at:
C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins
IT'S IN THE README FILE
FOR THOSE WITH PAINT SHOP PRO
ftp://download.nvidia.com/developer/..._Pro_Steps.pdf